I just wanted to say that there are D7000 samples up on Imaging Resource for those that want to get a good look at the sensor that's "the same one" in the K-5 - it may give you a good idea of what to expect.
One thing I wanted to comment on was that the Nikon boys and indeed JohnBee had been proclaiming that the the D7000 and K-5 relatively are D700 rivaling in the ISO noise department. Well, to my eyes, the noise levels look about the same but there is definitely more detail in the D700 JPEGs (the red fabric holds way more information on the D700). What do you think?
At ISO 6400 (D7000 left, D700 right):