Before i start i must say, sorry for grammer and misspelling. Also i Know alot of this has been Brought up ,but hopefully the more Beth see's stuff we want, the more likly they might conceder doing it.

++World/Area: I Think it would be sweet for ES6 to be take place in all areas of Tamreil just like it did in ES Arena. Or like so many others are saying for it to take place in Akavir, it would also be sweet to see Atmora. But i like the idea of all of Tamreil because i would like to see this war between the empire and the thalmor finished and what better way to Fight a war then across the whole continent

Another Area to look at would be the plains of Oblivion we havent seen yet like hircines hunting grounds or Vales domain, or go in the reverse and be touched by the Divines and enter the heveans or something along those line. Also being a piriate would be sweet they have ships and Captains plus crews in Oblivion/Skyrim, So why cant i have a pirate crew and go to sea (This could be DLC possibley)

++Race: ive always been a fan of the Wood Elf and i like how they made all the races look different from the gap from Oblivion to Skyrim. But each race should be more defined and in depth for what they are (Ex. Orc vs. Wood Elf... Orc wins in hand to hand, Elf wins in hunting) Make things like that more apparent in the game.
Also i love (spoiler alert)..... How you showed two Snow Elfs in Dawngaurd and how they said "there could be more out there hiding in small camps" would be sweet to play as a snow elf possible even see dwemer would be a nice touch.

++Skill/Perks/Leveling: I like how they did the Skilling and perk Trees for Skyrim but i think it would be cool to have something like were you start the game as a Kid and thought a primary skill set (aka Combat, Stealth, Magic) have to sit and practice as a kid. (Ex. Using a bow First you would need to find a teacher/parents to show you how to hold the bow and shot, then go to target and practice and even though your cross hair my be dead center you still hit the outside of the target and that would be novice then work your way up novice to master) And do that the same way for stealth and magic. then at like level 5-10 a few years go by and you grow up and your a apperintance/adept at your primarey skills the you choose a secondary class(Ex. Prim. Combat/ Sec. Mage. and no skill at Stealth) and this could also play a role in the Factions you join but will get to that later. So if you had primary Combat you could use any weapons,smith,heavy&light armor use, and a secondary in Magic you could use some adept and lower spells like heal and flame ball but no expert or master spells and that would leave no room for stealth perk if you choose combat and magic. That would make you play your role more instead of being some god charactor.

Also i hate the world leveling as you do, Make some areas harder for lower levels. If your lvl 5 trying to go throught a lvl 20 monster then you will dying or be ballsey and try and sneak through, that would be a fun quest, Just please fix the world lvling around you.

++Customization: I Would like this to be 100% free roam, i would like to make a sword that looks different from everyother person and the better ingots i use the sharpper and stronger i can make it. Also make the armor look how i want it to change colors of it,sleeve lenghts, Armor piece placement, make it look new and shiney or old and rustey. Same for making Spells, bows ,normal clothes, ETC.

Also i like the houseing and family system for Hearthfire (just not all the bugs) i just wish i could of picked the plot of land the way i wanted my house to face how many wings i want and the positioning of everything in the house. OR go one step further cause this is coming from the person with 14.7M Gold in Skyrim.... Make a castle and city from nothing (sound kind of Sim's but i like the idea)

Aside from the playable Dwemer, and the being a kid for hours, those things sound nice. But a game of that magnitude (if you want it up to par with Oblivion/Skyrim) Would probably take a few decades to make with the level of detail we have come to expect. The technology simply doesn't exist. And if it does, it would be more expensive to make than any other game in existence. Wait awhile. When we're all old coots and our great grandkids are playing TES XIII, maybe we'll get a turn to try it out.