Well, if that's really ISO 6400 from a K20D on beta firmware, it's good enough for me. Looks kinda like ISO 1600 on the K10D, so yeah, that's a couple of stops improvement. Add to that better SR, and Pentax looks to have another solid product here (given the price is right).
You guys are right about the vertical pattern noise, though. We won't hear the end of it for a couple of months after the release if Pentax doesn't do something about it.
SAFOX IX maybe? And 5 FPS, at least? The K20D's current competition all come with at least 5 FPS.
Thanks for sharing Matjazz!