From our friends at rykoszet (who in turn reposted from wotexpress):
„Birds from Supertest chirp: “probably in the middle of May we will start testing the prize tank for one of the events that will take place this year, IX tier machine. You must be patient. “
It will probably be the award for the Frontline, because the ranked battles are still ahead. There is no information about the vehicle itself, except that it will be 95% special tank (not premium!) … The tank is completely new.”