There was mention of additional Tank class. Chances are they did not finalize what they would do until 2.0 took off and they get some data to see who is playing what and what is short on. That is why they seem to suggest a new Tank class. Unlikely 2.1 (in past, they always gave lots of notice, sneak peaks, and tips on what you need to do to unlock). Maybe 2.2, would not be surprised if it was pushed out to 2.3.

The issue is that a new class is, sadly, not 'much content'. We can level it up quickly and then be done with it. They need to add more content. Adding a new class is a lot of work but does not occupy people for many hours. So I think they will focus on throwing enough content at us to keep us busy, and THEN new class.