First of all it's 3 and 4 player, since it can be 1v1v1, 1v1v1v1, 2v1v1, 2v2, 1v2, and so on, it's much easier to call it 3 and 4 player. -.-
and if I remember correctly, there were a lot of bugs related to mods, points, and replays, which is why it didn't come out with 3.0, I don't when it will come out officially.