Hi Allen,
Welcome to the forum.
I am in a similar situation to yourself, having a DS and wondering if I should make the move to the K10D.
My read on it is that I actually have the "best of both worlds" option by waiting. That way I can get a look at the new camera and I have no doubt there will be a few K10D's on the shelf for awhile that probably will not get any more expensive....particularly once the new camera is announced.
As for your old lenses...that is the beauty of Pentax, the backwards compatibility of all the old K mount lenses.
Good Luck.
Grant