I seriously think you should consider throwing back a couple weapons even if you can't do weapon 'packs'. Some of the most used classes would have to be the AR's, SMG's and MP's so bring back the Tar-21, Vector and M93R. If there's room, let the quickscopers have their Intervention back too.
I miss some of the MW2 guns too. TAR 21 was always a favorite. They gave us Terminal to remember the good ol' days of MW2 and then wrecked it with bad spawns. I guess they had to put a "MW3 touch to it."
I would like to see another wepaon that isnt so samey eg a another single shot gun (FNFAL M21) or how about for a giggle a WAW weapon in MW3 one of the bolt actions I loved those wepaons without the scopes made me feel all pro dropping people in one shot without a scope