I'll go first:
100m - Gay, Gatlin, Rodgers, Dix
200m - Gay, Dix, Gatlin
400m - Merritt, Nellum, Mance (McQuay)
Yes, Gay, Gatlin, and Dix are all declared for both the 100 and 200, and they are hard to ignore. Rodgers has been so consistent that I think he will edge into third in the 100m.
As fat as Dix is, he is a force. I think he will make the 4x1 relay squad, and that he will finish with a convincing silver in the 200m.
In the 4, Merritt is clearly the favorite, and the other 3 I picked I did so just on time this year, because they have all been running well, and could easily exchange finishing positions.
I hereby declare that all contributors to this thread get to change their predictions once if all their original picks remain healthy, and unlimited times in the event that any selected athlete goes down with injury or withdraws.