Source from DPR:
http://forums.dpreview.com/forums/read.asp?forum=1036&message=20121509
Model name ( tentative ) : PENTAX 645 Digital
Product information & marketing schedule :
- 18 effective megapixels
- PENTAX 645AF mount
- Compatibility with existing smc PENTAX 645-series lenses
- Marketing schedule to be announced later
Other information :
This product will be continuously upgraded by incorporating newly developed image sensors, with its final effective megapixels expected to reach a 30-megapixel level.
Original source:
http://www.pentax.co.jp/english/news/2006/200646.html
That's exciting ...