This isn't my source... I don't have one!
But, I happen to know someone from another Patriots' message-board who is connected to the Pats fairly well, and generally has a good feel for what's going on. Here was the update he offered today:
Talib will play Sunday night, at least 'til his hip tightens up on him. He should have an easier time covering D. Thomas who is a long strider. He practiced today.
Gregory could play with a short arm cast. He's also practicing.
Dennard had a short arthroscopic procedure and may be able to play if the pain is bearable for him. I doubt it. If not, Cole may be attached to Welker at the hip. He's the only shorter, quicker CB we have. Dennard practiced today but limped noticeably.
Arrington, (I'm uncertain of,) but I think (he's a go.)