Prices will be fairly consistent across dealers. I don't think it will move from "7-series" to "3-series" (though I prefer MB myself!
These are small production, hand made devices with very high sensor costs. The offer of upgrades strikes me as a bargain in itself. Also, the $17k is for the value added. If you don't need the 3yr coverage, it can be 2-3k cheaper.
I am waiting for the P65+ with Sensor+ from Capture Integration. I had a chance to test the P65+ and it was impressive. I have the P45+ and would NOT have done it for the extra pixels, but the sensor+ and the other (higher frame rate) are well worth it to me, although I am just a 'very serious' amateur' (maybe 20k images a year). Michael says the overall technology is a step up, and with all the ALpa, Contax and Hasselblad I have accummulated so the 17k is a relatively small investment to stay 'state of the art'
BTW, where can you get a used 7 series for 17k?
Victor