Ricoh will have a presentation of a mirrorless APS-C camera on November 12th, 2009. The camera will be available in December 2009. I am expecting more details in the next few days.
This is the information I posted two months ago on this rumor:
Ricoh is working on a compact camera based on Pentax’s K mount. It’s not clear if they would use the exact K mount or the M 4/3 approach by keeping the mount diameter in-tact and reducing the distance so that older K mount lenses still can be used via an adapter and a new series of new “micro K mount” lenses will be introduced.