on the 360, we've already gotten alot of maps. Far as game modes, I think there's plenty in the game modes already. However, there's already a section in these forums where you can post your suggestions. Hopefully the Devs read them, if not we've all posted for no reason.
1st person weapon view isn't something they will add in an update, and possibly might not ever add. Ghost Recon started with the reticle view, and I doubt they'll ever change that.