I acquired my K5 in January. Upgraded from a K20 and felt a bit guilty doing it, since the K20 was still going strong after 3 years. I acquired it also at the end of its model run and the timing was perfect. Yes the K7 came out and then the K5, but it still took great pictures. The only reason why I upgraded was the ISO 80, the dynamic range along with its ability in the shadows and ambient low light. When I got the K20 I knew it was going to be superseded, but it did not matter. It was a tremendous step up from my K100 - the dual wheels with the extra controls made photography sooooo much more enjoyable. I think you will find the same. Also, I really did not want to pay the price of the newly introduced model.
For me the deal sealer was the pricing I ran across - tremendous price so I pulled the trigger. Now, that was back in January and the prices have bounced up a bit. However, regardless of what Pentax comes out with - I am set. I really don't care what the new model does (other than make me an Ansel Adams, which is very doubtful), as the K5 essentially does everything, I need and want. Its a real joy to use.
... just my 2 cents....