From DPReview:
Epson Japan has today announced a subtly improved version of its unique R-D1 Digital Rangefinder Camera. Just like the R-D1 the R-D1s features the a six megapixel APS-C size sensor and supports Leica M and L mount lenses. New features include a ‘Quick View’ record review function, RAW+ JPEG support, Adobe RGB color space, image parameter control, long exposure noise reduction and higher playback magnification.
Here.