What it says in the title. Nike was awarded the NFL uniform contract in 2010 and they're debuting all the new gear today. There aren't going to be too many crazy changes due to some NFL rules about how often you can redesign your jerseys... but there might be some crazy concepts or "throwbacks" that debut, I don't know the NFL rules about that.
Uniwatch is there and tweeting some pictures. @uniwatch or the link above.
EDIT: Wow, the hype machine was on today. For most teams, no changes: