My guess is, because the takeover by Behaviour, they cannot really make any announcements until they finalize plans for the future of the game.
We already know about 3.0 and 4.0; the rest is uncertain at this point (like story mode... 5.0, 6.0...? Who knows!)
One thing for sure; we cannot take for granted any old roadmap and such as things have or might change because of the acquisition by Behaviour Interactive... What kind of behaviour is that!?!

(Kidding as I'm sure TFP will still make the game they want)