I wouldn't hold my breath waiting for the MMM. Heck, I'd be satisfied (for now) with a software fix for the MM so that I could run Neu motors.

The MM is a fine controller and does well on 4S, especially in a buggy. I'd track down a Lehner 1930 hi amp in about a 2000kv or so flavor to run with the MM. I doubt that the combo would leave you disappointed.