I think that WHEN they do a new map pack, it will contain crossfire and a few more maps. I doubt they will add guns because they never have in the past and to do so would honestly be a waste of time. On COD4 people made the most of the guns so why bother adding more this time round?
On another note, I am thoroughly dissapointed with the map pack. They shouldn't have bothered with the STUPID 'mosh pit' like playlist because all that has been happening is I end up playing search again and again, which I don't like...