Lots of New tanks. maybe not so great :-(

TeriyakiTanker: You aren't forced to go through a new line, as a matter of fact every time they introduce a new nation you basically get a free garage slot.  Every year there are numerous opportunities to win free garage slots, so if you don't want to spend money you should easily be able to get extra garage slots by participating in marathons, missions, on the on-tracks.  I actually think you could get a couple of free garage slots for playing an Italian tank in 9 games or something along those lines.