The sticky's on this forum summarize (rumors) info that answers 2/3 of your questions:
http://x3.xbimmers.com/forums/showthread.php?t=1254416
Quote:
As we've shared before, the F97 X3 M is being powered by an all-new S58 engine, which should also power the next generation M3 and M4. It's expected to make 450-460 HP in the X3 M.
Expect the first ever BMW X3 M to be introduced in early 2019 and begin production as a MY2020 vehicle (U.S.).
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Re: price - add a few $k to the price of an M3 and you'll probably be spot on ($70-75k)