the cloud servers is the largest feature on this list besides the cross game chat.
dual log ins on the same system would be nice as well. (even though i didn't see that listed)
Being able to play a co-op game at my friends house while simultaneously saving the game to both of our accounts and earning trophies for both accounts as well (via cloud server) would be amazing.
BUT even if it is just 1 account at a time, my friends can come over and sign in under their account and earn trophies for their account on my system. This would be nice because occasionally a friend will come over with a new game, but we usually don't want to play too long because they know they will just have to re-play it later on their own system.
also the idea of tokens could be huge if implemented correctly, this combined with the game specific challenges or whatever will greatly expand upon the whole concept of achievements and trophies.
̶3̶R̶D̶ 2ND! Place has never been so sweet.
