New maps are already on the way in next updates and the other things you mentioned are also contemplated since those things are already present in the ZC1, although I think there is no such thing as a healing grenade there is a zombie type that drops a healing kit in ZC1 so I assume that there will be some kind of adaptation for ZC2 for these particular class (IDK).
Moving on, there is already an “infection bomb” but its only given to the first Zombie of a normal round, and thats great for balance… it would be stupid to just be giving these infection bazookas for AP in normal rounds to anybody… it would make all the hideouts pointless