Let me share my 30mins hands on preview of both K-5 and K-r.
Pentax has upgraded the interface for both new camera, and its slightly better than K-7 and Kx.
Some of the common features are:
1. Custom NR settings for different ISO (which I really like!!!)
2. Moving some custom settings to shooting settings
3. Can't remember anymore. :P
I've tested the shutter sound of K-r and K-x side by side, and I can't tell the difference, so no new improvement in that department.
K-5 shutter sound's quieter than K-7 when I shot them side by side. Really like the queiter sound.
I then tested the AF of K-5 and K-r with 18-55 and 18-135. My gut feel is that they are slightly faster than K-7 and K-x.
I shot K7 and K5 using AV setting, 135mm f5.6 auto ISO 3200 shutter 1/125s (maybe 1/160) and the noise of K5 is a lot better than K7 using side by side comparison on the default LCD zoomed in at 9.5x magnification. My estimation of the noise grain advantage is about 2x between them. I managed to reduce the difference to about 1x when I changed the custom image setting of K-7 to -4 High/Low Key -3 contrast -3 sharpening.
Sadly they sealed the memory card door in Pentax Square, else I would have shared the photos with you guys. Just treat this as an early appetizer to the real reviews from other sites I guess.
On the new 18-135mm lens, I think it focuses faster than my 16-50. It is very "spirited" when I change focus point from close to far object. The zoom ring that is on the far end of the lens (reverse of your typical focus and zoom ring) takes a while to get use to. Ok, maybe 10 sec.
I'll let other sites to test the sharpness and other quality of the lens. My impression is, its quite a nice walk-around lens for vacation and holiday just like the discontinued 18-250mm.
If K7 and Kx share the same Prime II processor as K5 and K-r, then I would want Pentax to upgrade my old camera with the new interface.
One last note, I asked for the DA(L) 35mm f2.4, and they don't have it yet. Scheduled release date in Nov.
Thats all from me.
Mike