http://forums.nasioc.com/forums/show....php?t=2616097
Page 1 has the panel taken off, page 2 has the full installed Pioneer AVIC-x940BT. I have a similar unit in my '11 (AVIC-x9310BT) and the GPS antenna is just a small little black magnetic cube that I stuck to the top of the radio and sits inside the dash. No bulky unit to mount to the windshield.
You can retain SWCs with a PAC or Axxess module. Not sure if they support the new 2015 yet, but should shortly.