Upload & Sell: On
If it's just APS-C ala Fuji X then I'm not sure they'd sell many at all. I see they've put the letter M in quotation marks, perhaps it's nothing really M related at all, or very loosely.
It may still sell if the sensor is specifically designed with microlenses for M mount glass? Since Leica is relatively small setup, it might well be easier for them to use the M(240) sensor and make it full frame? The EVF operation on my M240 is quite sluggish though, so it remains to be seen. All speculation on my part at this point.