Indie developer Carbon Games were showing off the latest version of their RTS/MOBA hybrid called AirMech at PAX East 2012 and I chatted with a member of the developer about the game.  The idea of it is a hybrid of the genres, players won't be building any bases like traditional RTS games, but they will have a variety of structures to manage units from.  And unlike most MOBA games (think League of Legends) - players have more direct control over the other units on the battlefield.