Phosphor Games of Horn [$1.99] fame has revealed their upcoming 2D MOBA, WARP. An acronym for "Warriors of the Red Planet", this will have 3-on-3 online battle with gameplay that mixes in platforming aspects with the standard MOBA formula of attacking bases and customizing character loadouts.
With the 2D gameplay, it sounds a lot like the formula of Ronimo Games' Awesomenauts, what with the variety of characters and robots that serve as the creeps. Of course, Awesomenauts is a great game, and not yet on mobile, so this could fill an interesting niche. DeNA will be publishing the game, so expect this to be free-to-play, but then again, Zynga published Horn and it was paid, so who knows.
WARP: Warriors of the Red Planet Upcoming AppWatch Button Watch App