I actually like this idea, although I don't expect it to be added to Skyrim. The next TES game, perhaps?
While I'm not entirely sure how you'd level up a racial perk tree (maybe it wouldn't work like the rest of the skills. Every five levels you gain one point to put into a racial perk, perhaps?), but it sounds interesting none the less. For Altmer you could have ones that provide a large boost to your magicka pool, make it increase faster and ones that improve the effects of various schools of magic. Khajiit would probably gain ones that soften footsteps, allow night vision and the like. I can imagine them having a high level one that gives them detect life. Khajiit don't use their noses enough. ^^
While I'm not entirely sure how you'd level up a racial perk tree (maybe it wouldn't work like the rest of the skills. Every five levels you gain one point to put into a racial perk, perhaps?), but it sounds interesting none the less. For Altmer you could have ones that provide a large boost to your magicka pool, make it increase faster and ones that improve the effects of various schools of magic. Khajiit would probably gain ones that soften footsteps, allow night vision and the like. I can imagine them having a high level one that gives them detect life. Khajiit don't use their noses enough. ^^
I would actually think it could be like the wolf/vamp trees, racial perk level increases with power usage. although that would make it really easy for an overpowered khajiit.

......) so we will have to wait and see whats up their sleeves. Let me know what you guys think, how is Dawnguard beta treating you, is it worth the price or do we hold off?