Maybe my information is off but for campaign servers you can only have a maximum up to 4 people, including yourself. Does this apply to Versus servers, meaning can you only PvP against 3 other people?
No. I'm not entirely sure whether we have 4v4 or anything like that, but we do at least have 3v3.
PvP is not a server type.
There are Arenas; in which you can perform 2v2, 3v3 and 4v4 since the last bit of info we have received.
I'm actually not even sure they are available in beta. I've watch several streams, but no one was running Arenas.