Leica has been reported to be working on a new M camera for some time now, and if these recent leaks (which seem to be pretty cut and dry) are legit, then it appears that upcoming M will be called the M10. This will be a pretty big change overall in Leica’s history as they’ve never had an M camera with two numbers in the name overall.
So far the rumors are not specific about that the internals will be, other than that they expect it to carry the same 24MP sensor as the Leica SL. That would also mean a similar ISO range of up to 50,000 ISO. Considering its predecessor’s (The Leica M) design, it’s also bound to have video upgrades and weather sealing of some sort.