Wargaming.net is into, well, war. More importantly, games about wars. They’ve got Order of War which covers a more strategy-oriented crowd and includes, ground and air troops. They’ve got Galactic Assault which takes you up against aliens in a strategic way. 
There’s also Massive Assault which had some land, sea and air units in the real-time strategy game and of course the currently, wildly popular World of Tanks (which was why we were hanging out with them at E3 aside from them just being a cool bunch of guys).
Up until that last title, all of their games were mixed unit strategy games. With the advent of World of Tanks they pretty much just focused on one thing, tanks. Sure, there’s artillery but they’re pretty close to the tank. Sort of like the big-nosed cousin, something not with such big feet (tracks) at times.
So if this is the way they’re moving, then will we see a World of Planes? How about a World of Ships? 
World of Guns just seems sort of silly but could certainly work for an MMOFPS. But that’s really been done over and over again and I think Wargaming.net knows that and might shy away from it in favor of other, more interesting projects.
The latest move by them in focusing on just one aspect of war, tank warfare, means that the game will only appeal to a subset of players. But it will also allow them to make a series of games in the "World of..." series where each one focuses on a different aspect of warfare: land, air, sea... perhaps even space and infantry.
