BAT-4M — Ember (USSR, Defender).
This is a new tank + Agent that supertesters have already seen, and it will be publicly available to play from February 6th during the Alpha test.
This is far from the only NEW tank and agent that you will be able to play for the first time. Also, most likely, this month the developers will give you another new map to try out. + Many old tanks and agents have been reworked.