E-Revo on Neu 1515 1Y

I mentioned in another post that I have been reading for awhile, but not posting. I am sorry if I am a little slow on the up take, but I am still trying to get an understanding of the Neu motors. I am planning on building an E-Revo and would like to run a Neu 1515 1Y on 4S lipo with the MM and UBEC. I have 2 questions, the first is will this be an efficient system, anything else I need to do? The second is, when wave 2 of the MMM comes out, can I upgrade to it with 6S Lipo on this motor, or would I need a different motor? Thanks for your input.