We still have no current plans to support additional game modes with a queue. The long and short of it is that we feel that splitting the population right now is really risky and could have a major negative impact on the game.
That being said, as mentioned in the Tournaments thread, we do plan to support additional game modes, to some degree, with event tournaments. The frequency of these tournaments will be determined, in part, by how popular these tournaments become. Our first special tournament will likely be a 2v2 tournament. I also foresee the possibility of Stronghold and even Courtyard tournaments.
In addition, we’re currently discussing the feasibility of adding custom arena support/special tournament support for large team (15 v 15?) elimination style matches. This does get a bit more complicated as the current UI breaks with anything more than 10 v 10.
What other game modes would you like to see show up in tournaments? Keep in mind that any game modes requiring new maps would involve quite a long development time.