If you can't afford a digital back to Hasselblad or Mamiya, you will not afford a digital 645.
We discussed this in a swedish forum yesterday. Someone there said that there are about 10.000 sold digital medium format in the world per year. Imagine what prices you need to have a on a Pentax house. Obviously Pentax/Hoya knows this, they are not stupid. And if they could see a market for digital mediumformat, they would not have put the project on ice.
Unfortunally I see the same problem with fullformat. And I think Hoya/Pentax see this aswell and therefor I don't think there will be a fullformat Pentax anytime soon either. The costs of building up a second lenspark (to go along with the DA series) and the cost of taking a new format into production will be too high at the moment. The money has to come from somewhere.
- Pentax just declared that they are closing a lens factory.
- Pentax just introduced another DA camera.
- Pentax introduced so many new lenses lately that they have trouble keeping up production. And they have more to come.
For these reasons, I don't think you have to worry too much about fullformat lenses now. I think Pentax will come out with another camera next year a K1D or something. But I do not think that it will be a fullformat. But rather a spiced up APS. And I do believe that Pentax will continue for quite a while to build on the APS, because thats where the customers are.
EDIT: Another aspect is the aperture ring though. Pisses me off that there is no Aperture ring on the DA series.