More news/rumours on the full specs:
http://digicame-info.com/2016/02/k-1-2.html
- 36.4MP CMOS sensor. No low pass filter. 
- Real resolution (pixel shift) 
- Image processing engine PRIME IV 
- Sensor Size: 35.9 x 24.0mm 
- Video is full HD 60p 
- 4K interval movie 
- 14-bit RAW 
- DR II 
- KAF2 mount (KAF3, KAF2, KAF, KA, compatible with power zoom lens) 
- AF sensor SAFOX12. AF point is 33 points (25 points are cross-type). -3EV Correspondence 
- AF assist light 
- Viewfinder magnification 0.70 times. 100% field of view 
- Natural-Bright-Matte III focusing screen
- LCD monitor 3.2 inches 1,037,000 dot. Flexible tilting 
- GPS built-in. Wi-Fi built-in 
- Shutter unit of the compact new design. Durability is 300,000 shots 
- Shutter speed is 30 seconds -1/8000 seconds. Synchro speed is 1/200 sec 
- Media SD / SDHC / SDXC (UHS-I). Dual card slot 
- USB terminal (USB2.0, micro B), HDMI terminal (type D) 
- Microphone jack, a headphone jack, X contact 
- 5-axis camera shake correction. Effective for five stops. 
- Electronic Level 
- Photometry sensor 86000 pixel RGB sensor 
- ISO range is 100-204800 
- Continuous shooting 4.4 frames / sec (full size). 6.5 frames / sec. (APS-C) 
- Buffer 70 shots JPEG, 17 shots RAW (when full-size 4.4 frames / sec.) 
- The battery is D-LI90 
- Battery life is 760 shots 
- The body is magnesium alloy and stainless steel. Dust and water resistant. -10 Degrees of resistance to low temperature 
- Size: 136.5 x110 x 85.5mm 
- Weight: 925g