problem that I see is:
if you(as the photographer) can't pay this puppy off within a year, what's the point in buying it? Just so you can say you have 80 MEGAPIXELS?(oooooh.... big word)
professionals(at least the ones I'm assisting here in LA) aren't needing even the 40mp of the P40+ back. Its too much for them. Most are perfectly fine with a 5dmII capture, and even then, its too much, and needs to be down-sized for the client. *note* this is usually done BY THE CLIENT.
what you have left is RICH AMATEURS, doctors, lawyers, and trust-fund babies to soak up the rest of the product availability(hopefully). And of course a few "fine art" people who feel they need to make more 40"x50" prints.
people seemed perfectly happy when we were at 33mp(Aptus 75s). Is the extra resolution a welcome addition? Why not? But spending ANOTHER $30k to update your back to the latest and greatest? Most IMO will really have to think AT LEAST twice about doing this. Watching an Aptus 75S sell on E-prey a few weeks ago for like $6k(under 10k shot count too, with mount-swap and extended warranty still on it), I think most people will be trying to get the most life out of their backs that they can.
and just imagine the moire problems on this sucker...
can't they just bring out a 40mp 6x7 chip already? Enough of this 645 crap, RZ's were the mainstay 15yrs ago, and there's 1000's of them floating around, waiting to be used in a digital world(and rightly so).
c'mon leaf(and phase), bite the bullet and do a 6x7 chip(convince Kodak and Dalsa there's a good reason).
and lastly.... THIS WON'T MAKE YOU BETTER PICTURES, JUST BIGGER FILES. learn to photograph, then let the equipment follow