The japanese website Egami.blog found a new Ricoh patent application 2010-175627 (published August 12, 2010, filled January 27, 2009) . It appears to be a new 35mm f/1.8 Macro lens with following specifications:
- focal length f=33.1mm
- aperture Fno=1.80
- image circle 28.4mm
- macro 1:2
- floating focus mechanism
Found via photorumors