I owned the K10D ... loved it and gave it to my son as a gift, plus a DA 18-250!

I own now the K20D AND the K7 ... love them both actually, and for different reasons.
I use the K20D more often than the K7 under low light conditions when it requires to go ISO 1000-1250 or up.
The K7 AF is, in my own opinion and lots of use, faster and more accurate than that of the K20D. I also like the af-assist lamp ... great little feature.
Now, am I excited about the K5 specs?
I will know more tomorrow, when Pentax releases some official news.
I will maybe get excited when I start seeing shots taken by "real" users, not just by some biased review outfit.
On my priority list for considering an "upgrade" from my K7 to the K5:
1. faster and more accurate AF
2. AF tracking capability (this may never happen, but ... I am hoping)
3. high ISO handling at above 1250-1600.
Then, if those conditions are met, I sure would get excited and would likely upgrade (if that is the right word to use ... never know, Pentax may still have some secret "flagship" model above the not-yet-arrived K5), but not until real tests come out and if the price is suitably interesting.
JP