Get me up to date! Need info please

[Rivermaxx]

I need 2 escs I'll use the mmm for my buggy build. Just want what ever is the newest version esc is but not sure which is newer esc , xo1 or mmx ?. Not going to run the 1717, 2200 has plenty of power. Is the x01 esc basically a mmm with extra capacitors? Or is it more programmable? Is the new blue case traxxas escs the same water proof castle mmx? Read something about being locked too. What's the deal with that?