You can see a digicame-watch article below on the 645D 2014.
http://dc.watch.impress.co.jp/docs/news/20140214_635195.html
Here is a Google translation.
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The first part is just a brief introduction of Ricoh Imaging booth at CP+. You can see several photos of gears like a 645D 2014, a TELEPHOTO MACRO lens for Q, a Film duplicator, a RICOH WG-4 GPS/WG-4, and a RICOH WG-20.
The second part is Mikio Tanaka's interview with Pentax's Yasuyuki Maekawa. Mikio Tanaka is a famous photographer in Japan. Here is Mr. Tanaka's forecast on the 645D 2014:
40-50 megapixel image sensor
SAFOX XI for AF sensor
3 fps
102400 or 204800 for the highest ISO
withstand 100,000 shutter releases
USB 3.0
live view with video mode
tethered shooting or multi-exposure like the K-3
less than $10,000
Mr. Maekawa didn't comment on whether Mr. Tanaka's prediction is correct or not, though Mr. Maekawa hinted some:
The 645D 2014 uses the same sensor as Phase One's digital back.
The sensor size is changed from 44×33mm of the current 645D, but no big change.
The price should be reasonable.
To change the shutter speed from 1/4000 to 1/8000 is difficult.
SR is difficult due to the sensor size.
Use FLUCARD regarding to Wi-Fi
That's all about the 645D 2014. According to Mr. Maekawa, even the development team has talked about the TELEPHOTO MACRO lens for Q very favorably.