Designed to appeal to photogs who have MF kit and DSLR - sort of hybrid between the two
Is 'long-term investment' for Leica (aka betting firm on it me thinks)
30mm x 45mm sensor - 56% larger than FF
New lenses, some leaf shutter for higher flash sync
$$$ - unknown but assured to be nasty (rumored at Euro 25-30,000 - I assume body or body+kit lens)
Tech will eventually 'trickle down' to a new R (that said, sounds as if S2 and M8 will be the linchpin products for Leica)
No word on if will take R glass, but will likely need adapters IF will take them.
Logic - assuredly debatable.
Very interesting tech but IMHO - will have a TOUGH time permeating professional MF user market due to (in no order) only (I assume) Leica lenses can be used, likely cost, Leica service & support, penetration into rental houses, etc.
Very neat concept but going smack up against 30MP+ MF systems from Hassy, Phamiya, Sinar, etc - all of which are dropping in price like a rock, have much greater market penetration, wider lens selection (and cross-platform use of lenses with stop-down), wider Svc & Support operation - and established reputations re: electronics reliability.
Also with MFDB prices dropping and the advent of $2700 21MP FF DSLRs, many photogs can more easily afford to have both a MFDB and DSLR and, with adapters, have a backup unit of some repute on hand.