I posted this list in another thread, but since they are all wishes for K10D's successor, here's the list again:
An intelligent, dedicated WB button for measuring/setting WB that works fine without a gray card (just like Canon XH A1)
Better dynamic range (a la Fuji S5 PRO)
More megapixels (allows for more cropping)
Better looking menus
Focus assist lamp instead of flash
Better in-camera JPEG sharpness for JPEG users
More dedicated buttons
Better Auto AWB for incandescent light
Full LiveView with digital real time view of DOF and WB
Extra Function button
Recent Settings (like D200, look here:
Ryan Brenizer Photography - S5 Pro Review Part II: The Bad )
Sigma SD14-like image quality /color naturalness / sharpness:
SIGMA SD14:Sample Image Gallery:Portrait
Keep the small size: Small Is The New Big