Even if you just want something with aPentax lens mount that's not aPentax, the GX-1S "seems to be a re-branded Pentax" according to DCI, so you should probably put that credit card away for now and see what develops in time for Photokina in a few months.
Additionally, Adorama, aPENTAX retail partner, will display the full line up of Q10 colors in their retail location offering a seamless ordering process for each custom camera.