Chaos Heroes Online looks as if it's set to be just that. If you've found yourself saying that you've got only a limited number of MOBAs to play and really need another one on the pile, this game will completely satisfy you by virtue of being a MOBA and being released this fall.
Chaos Heroes Online is based on a variant of the original genre-defining Defense of the Ancients mod for Warcraft III, and its main claim to fame is offering players the ability to gear up from anywhere on the map rather than requiring anyone to return to base. Beyond that, it offers... well, you can probably guess what it offers if you're familiar with other MOBAs. Because that's what it is. Purely. You can check out the trailer past the cut if you have a mighty need for another MOBA.
[Source: Aeria Games press release]