We tested it yesterday in 4v4 (on steppes) 2 Soviet industry 1 USF 1 Brit. vs 3 OKW 1 Ostheer. Was fun game that was really close (allies win).
The KV2 is amazing to lock down territory. Its great vs vet5 volk blob en KT spam meta. 240 damage and a lot of penatration. Only real counter to it is JT (wich they got, but was to late, and under constant pressure). We had 2 KV2's in siege mode at the top/ mid VP's supported with Kat and Jacksons.
Another thing to do is build the repair stations behind the KV2 in siege mode >unkillable. Its like hullingdown KT with mech building behind it