I doubt Pentax can make money with a FF venture, and I think Pentax knows that.
Just look at this forum (or even my local Pentax one)
Pentaxians are generally pretty 'smart' and smart with their money (ok, if I was not politically correct, I'd use the word 'cheap'
) , as well as knowing that they can do pretty well with their current gear (I'll be politically correct and use the term 'skilled'
) .
This contrasts very much with what I see from Canikony forums, where the advice is always "Go XXX and no need to look back" or other similar "good advice"
Pentax won't make much money with its 'fans' sticking to age old *istD or the best of the best K200 when the FF is released.
So many want to pick it up for bargin prices during the end of the product lifecycle.
I'll be happy to see a Pentax FF, and I'd certainly get one (either upon release or within 1 tier of price drop ... see I'm cheap too)
But I won't count on them coming up with one.
Those who want FF NOW, I suggest just look to a 2nd hand 5D, 5DII or D700 and end the pain.
There will be trade-offs, but at the prices that those cameras are at now, don't think there is much to complain about.
However, IMO, they can only give that shallower DOF look for a similar FOV compared to what APS-C can offer now.
Resolution.... there is a far more powerful option in a smaller package (Foveon)