Here's why I doubt it will be MMOFPS, Blizzard makes games that will run on older machines, and they are pretty serious about not requiring perfect internet connections for online play. The Asian market is particularly sensitive to high system requirements. Blizzard has never released a game that had spectacular graphics, they have always made things work with simple engines and low detail (with amazing art direction).
But for a FPS (MMO or SP) on PCs you need to use cutting-edge graphics, and unless they can come up with an entirely new control system the player with the lower ping has a huge advantage. This is not Blizzard's style, they haven't made an action/twitch game in a long long time (Blackthorne anyone?).