HvsH, Ambush and Tremball (by default).
Since its not open-source, you can't just willy-nilly it. Nothing like old Trem.
And other Gamemodes will be in normal game or DLC??
I remember having Zombie mode on the original tremulous. They did not take it out because when you try to create you're own server it says 'ZOMBIE MODE' at the bottom.
But i like Zombie server! And i think more other players.