I've had a character concept that I've wanted to play for a very long time now. The character is an orc who is an assassin that became a warlock, lost his powers, and is now regaining them. Thus, the character would be Magic-heavy (Destruction, Conjuration, Illusion, Alteration) with a bit of Stealth (not sure how the abilities shape up for Skyrim, but daggers and some skull-duggery). However, in Morrowind and Oblivion I've never really gotten this character off the ground. The reason for this is the overwhelming advantage of (if not outright need for) choosing Breton or Altmer as your race for a Mage character. Considering how expensive higher-level Destruction and especially Conjuration spells could get, I could never really justify turning away from 50% more or 150% more Mana.
So there is a question in all of this. Will Skyrim continue the trend of Breton/Altmer Mage dominance? I know it makes sense for those races to be the best Mages, but I don't think that they need to be so much better that it discourages creativity. Offering the same kind of huge Mana bonus would certainly continue that trend. There are, however, other ways to reward players for choosing race-appropriate skills that doesn't punish players for going against types. How about offering additional perks for characters that invest in skills that reflect their race's strengths? A Breton who spends points in Conjuration might get an additional Perk to either delve deeper into a tree or dip into an additional branch. An Orc could get that option for spending points on Smithing, or Block. Perhaps the starting skill bonuses will already accomplish this.
I'm all for making race choice matter more, but I've just always felt that the Breton and Altmer Mana (Magicka?) bonuses were a bit over the top. Certainly Warrior type characters weren't pushed to pick Orc, Nord, or Redguard in the same way. What does everyone else feel about this?
The extra magicka did come in really handy, but I always preferred a Dark Elf to an Altmer or Breton. How did I cope?
Well, in Morrowind and Oblivion, I chose either the Mage or Apprentice Birthsign. Always did a lot of alchemy and conjuration so I could get the best Intellect stat-ups on my level ups. Enchanted my rings, necklaces, and gear to have bonus magicka. And don't forget that the magicka cost for spells (at least in Oblivion, can't remember for Morrowind) actually were lowered as your respective magic skill increased! While we're on the topic of enchanting, you can enchant your weapon to drain magicka per hit too! And, if all else failed, I kept a ton of restore magicka potions on hand.
So, in the end, it's not necessarily the "best" way to play a mage if you don't go Altmer/Breton, but it's very, very , very doable.