Originally posted by rparmar I don't see any relevance of this to whether you would buy a camera today. Who cares what the future of APS-C is... if it works in a camera today that takes the pictures you want then go for it. Using this logic you would never buy a computer, since there is no future in any of the current processors either. They are just going to get better and better and need new socket mounts your current computer does not support.
A camera is just a tool for using a lens. Invest in really good glass and update your body as you need later.
The problem with this theory is that the lenses available today, built for the APS-C format do not cover the full 35mm format. So, when (if) Pentax goes full frame, users of these lenses don't get to play in the full frame sandbox until they buy glass that covers the full frame.
Also, if the go full frame, they lose in camera shake reduction. I suspect they can go to around a 20mm x 30mm sensor and keep SR with full frame glass, but not bigger.