I doubt much will change.
I'm not sure why, but few people seem to remember that YC has (what appears to be) pretty much the exact same partnerships with Twitter[1] and JustinTV[2]. Both of these partnerships were announced, if I remember correctly, around this time last year as a part of the W09 applications. So far, I haven't seen any startups which have launched that take advantage of either partnership.
Given the seeming propensity of startups which leverage Facebook to get acquired, this could be a completely different ballgame though.