I currently have a 67II body in Colorado. It takes appx. 2 weeks for them to return an estimate to you--got mine last week. Then you either accept their estimate and send payment or you have them send it back to you. As mentioned by other posters, Pentax provides a Repair Order Number along with the estimate and even a return envelope. Plus there is a PIN # and directions for checking via the web. In your case you haven't received the estimate and info yet, so not sure what you should do.
Make sure you sent to their "new" service address. If not, I'd expect a delay while the Post Office Holiday Rush gets in the way of a reroute trip.
New Address: Pentax Imaging Service Department, 12061 Tejon St. Suite 600, Westiminster CO 80234.
Pentax Customer Service is unbelievably good. I've sent about a dozen items to them over the past 15 years (maintenance/CLA and repairs). They don't automatically try for same day turnaround, but the service is acceptably quick (except when my 600/4 flew to Japan for an extended vacation
)and very reasonably priced (scary low...shhhh don't tell the new owners).
Holiday mail crunch probably means you will get a letter from Pentax Service Dept. sometime between now and Christmas. Everything should work out fine...