The K-1 has is the first Pentax full-frame DSLR, featuring a 36.4-million-pixel sensor.
Main features:
36.4-million-pixel, full-frame sensor
Prime IV 14-Bit Image Processor
3.2inch Flextilt gapless screen, 1037K dots
SRII: In-built Shake Reduction sensor, 5-axis, 5stops
ISO100 up to 204,800
300,000 shutter rating, 1/8000s shutter speed
Pixel Shift Resolution with Motion Correction
AA (OLP) Filterless with AA Simulator
100% Field of View Pentaprism Viewfinder, 0.7x magnification
4.4fps full-frame JPEG L (70 frames, 17 raw)
6.5fps APS-C JPEG L (100frames, 50 raw)
33-AF points -3 EV, 25cross type
Weather Resistant with Magnesium Alloy Body
Wi-Fi connectivity built in
FullHD Video 60i,50i,30p,25p,24p, built in stereo mic
GPS, Electronic Compass, Astrotracer
Operation assist light
Lightroom plugin for tethered shooting (Image transmitter 2 is optional extra for live view tethered shooting)
Review: http://www.whatdigitalcamera.com/reviews/digital-slrs/pentax-k-1-review