It is going to be the one thing that wargaming.net isn't creating! A World of War simulator!
Honestly though I don't see what it matters when the priorities of coders, modellers and the entire development team is focused on the Flight Simulation aspect. The way I see it is that right now they are focusing on alot of coding problems and it appears that drivable vehicles had always been coded in since the beginning but just not implemented, the ground vehicles controls' listed being a fine example. The vehicles were already finished aswell, and possibly so were the interiors, it would not make sense to go and find resources on a vehicle and not get the interior while you were there.
Chancing a guess; even if the coders were needed, then possibly code was just adapted from the aircraft code, to work with the ground objects, obviously some new things were done, but they musn't have taken overly long. The ability to drive vehicles is a nice extra and the movie makers and mission designers are going to love it, obviously it won't draw the FPS crowd in to buy the sim, and that is not the point of it. As it is always said in the modding crowd for 1946; it adds a new dimension to the sim. Besides, if not now, it would have come at a later date anyway either from 1C or third party modders, as it has for 1946.
Although I don't know why, I am still waiting for my Su-26... But still looking forward to it's anticipated arrival! So to answer your question:
Yes. But now, it's even more immersive and simulating of a simulated war, and nothing great like this has really been done before.