I don't know from where you get that the K10D will soon be upgraded. It's a great new camera at an excellent price.
From Pentax themselves, January 28th will be the day of the announcement. The K10D is nearly a year old and they have to keep up with the Nikon D300 so to speak. It is a fantastic camera at a fantastic price, but it is going to be replaced by another fantastic camera (rumor is 14 megapixels and 5 frames per second) at nearly as fantastic a price.
It will be considered an update to the K10D, but as far as I know the K10D will still be available after the announcement, but in a middle position in the Pentax lineup rather than the top slot.
SLC