Interesting story from Engadget about YouTube creating an API designed to allow developers to build in livestreaming from XBOX, PS3 and PC games directly to YouTube.
As Engadget notes, a feature to livestream directly to YouTube was built in to Call of Duty: Black Ops 2, but it had some major limitations (aside from being a COD game, that is).
Even a feature that would capture and upload a gameplay session automatically but not necessarily livestream would be a huge step forward.