Both Infinity Ward and 2K Games posted the news on their forums, clearly stating that trophies will not be coming out for these titles. As for Insomniac, their Community Relations Manager, Bryan Intihar, responded to comments on the PlayStation Blog yesterday, stating that "currently, there are no plans to add trophies to R1 and RCF. Right now, our No. 1 focus is finishing R2 and making it the best game possible." If you're particularly optimistic, you can hope that they'll work on a patch after Resistance 2 is out. It would be nice, but we won't hold our breath.
Source - "No trophies in Call of Duty 4" @ InfinityWard.com
Source - Forum post @ 2KGames.com
Source - Bryan Intihar's comment response @ PlayStation Blog