Ricoh's upcoming 16mp GXR APS-C 24-85mm may (or may not) be f3.5-5.5
The previously mentioned road-mapped 16mp APS-C 24-85mm Ricoh GXR sensor+lens module may have an aperture of f3.5-5.5. This was posted at the Ricoh GR diary but since then, the post has been updated with the 3.5-5.5 information removed while the author is waiting to get more information. The original post (archived at Ricohforum) also mentioned a Jan-5-2012 announcement and a Jan-2012 release. (via Foto Actualidad and Ricoh Forum)
While you are at the GR Diary, be sure to read a very interesting discussion in the comments by hard-core fans of compact system cameras! This is not the silly one-liners you see in most forums and blogs, so it is a great read.