They're not giving out a huge amount of information on them just yet, but we expect more soon:
We are happy to announce a new vehicle type - combat helicopters! They play a very important role in modern warfare and they are an important part of the air forces of many countries, that’s why they are coming to War Thunder!
Completely new gameplay will become available in the next major update with these heavily armed war machines! We will talk about helicopters and new armoured vehicles in our devblog series that begins today.
War Thunder is actually a surprisingly fun game, definately going to be jumping back in when this update goes live.