At first I wanted to duel wield. Now I am afraid it will be terribly boring.
It is confirmed that we will be unable to block or parry while dual wielding.
It is confirmed that acrobatics will no longer exist, so we will be lucky if we see Journeyman (50) acrobatics dodge moves from Oblivion folded into another skill. The only possible option I see is putting it in Light Armor, and that's a stretch.
Pete Hines tweeted in response to a question regarding the ability to dodge (which only makes sense for a light and fast dual wielder) that there will be no dodge roll in Skyrim, but he also said "you either hit or you don't" which lends to the conclusion that Pete misunderstood the question and thought the question was referring to a chance-based dice roll like in Morrowind. Still, this answer came dangerously close to "you will be tanking damage if you want to dual wield."
It is confirmed that you will not be able to kite enemies by running backwards, as backwards movement speed has been slowed.
Why is this bad? Because it essentially means you have no defensive abilities when wielding two melee weapons, which means you don't have anything to do other than mash triggers, pause the game, and drink potions. Blocking is a huge part of combat in Oblivion and looks to be that way in Skyrim as well, because blocking an enemy's attack will stagger them and give you free hits on that enemy. You can see this in the 3 part gameplay trailer, where the player picks up two swords and goes against an enemy with a shield. The enemy blocks one of the player's attacks and the player staggers backwards, and the enemy gets a free hit off. Yea, the player kills the enemy in about 2 or 3 hits, but notice a couple of things here. First, the player is not rapidly chopping the enemy up, emphasized by the block that the enemy makes which staggers the player, so the increased attack speed which would come from having two weapons to attack with instead of one is not in the slightest made apparent here. Second, it is obvious that the player killed the enemy way faster than will be intended in the real game, if you look, when the player takes damage, their health bar barely moves, it is obvious that this gameplay trailer was played with tweaks in place so that the player didn't die in the middle of the demonstration, thus wasting time and being unable to demonstrate everything they wanted to show.
So from this information, this is what we can infer that a dual wielding playstyle will look like. You will approach enemies, either using stealth if you are playing a rogue type character, or by running up if you are playing more of a "barbarian" type. Then, you will engage them by mashing your triggers. You will likely not continue mashing triggers for significant DPS, because if there are multiple enemies, you will be getting hit like crazy and staggered backwards thus unable to freely attack. Also consider that the enemies will be blocking, and to avoid staggering, you must not attack when they block. So you will likely just turn around and sprint away, take some potions or cast a healing spell, then run back in and spam your triggers some more until you get staggered and the group of enemies beats your face while you are unable to protect yourself even by moving. At this point, you start to feel drowsy, because this playstyle consists of button mashing your two triggers and then pausing the game and healing yourself, and repeating this cycle. Soon you will fall asleep, and the cats that are fighting in your back yard will no longer be an insomnia-inducing problem.
Here, I will counter some of the weaker arguments against this type of opinion that I have seen made before.
A: You haven't played the game yet so you don't know if that is even how it will work.
R: I am free to infer how aspects of the game will play based on released information and make judgements based on that. If IGN, Gamespot, and similar companies can write articles talking about what parts of Skyrim look good or bad, I can do it too. I acknowledge that I may be wrong, but again, that does not in any way lend that I am not free to speak my mind.
A: Dual wielding would be overpowered, and other setups would be weak compared to it if you could dodge or parry.
R: False. Two handed weapons can parry, and yet they do significantly more damage than sword and board setups. In addition, why in God's name do you care if it is a bit easier for me, hundreds if not thousands of miles away from you, to complete the game when I am dual wielding than it is for you to complete the game playing as a sword and board class? It is a SINGLE PLAYER game. I am not going to suddenly appear in your game world and ruin your progress by doing work on your face with an overpowered class that you have no chance of defending against, so what the heck does it matter if one class is slightly more powerful than another? Besides, look at EVERY previous TES game. In almost all of them, sword and board classes have been the EASIEST classes to use because they have been the most powerful.
A: I want to dual wield, but I don't want the game to be too easy and being able to block or dodge might make it easy.
R: Being able to block or dodge would give you more than two buttons and a control stick to push during combat, meaning dual wielding wouldn't be a complete snooze fest because you would actually have to make decisions and time your attacks, dodges, and parries during combat. In addition, if you think that would make it too easy to be able to do that, then use the difficulty slider. Derp. Game too easy for you? Turn up difficulty.
A: The game is too late in development to change anything.
R: I wouldn't be talking about this on these forums in the first place if I thought I was going to get something changed. There are much more effective ways of communicating with a development company than posting on the forums that they do not read. I am here to share my opinions.
A: There are no free buttons for blocking when dual wielding, and certainly not for dodging.
R: For blocking while dual wielding, there could easily be a talent in the one handed tree that allows the player to use one of the 4 possible power attacks (done by moving either sideways, forewards, backwards, or standing still) as a parry or block. For dodging, there could be talents in Light Armor that allow you to perform a quick sidestep, a foreward roll, or quick backwards leap by simply moving in that direction and double tapping the jump button or holding the jump button, leaving a single tap of the jump button for simply jumping over obstacles.
A: Its not realistic to parry.
R: This is not only false, but also a ridiculous statement when you consider that you will be an elf casting magical spells against dragons. What do you think the hand guards on every single sword you have ever seen have been for? They aren't there just to look pretty.
A: Doing backflips looks stupid.
R: I can sympathize with that. But something other than normal-runspeed sideways movement to get out of the way of an attack, such as a fast sidestep manuever, would make combat much more interesting for dual wielders.