DPreview preview of Ricoh M-Mount module"The GXR Mount A12 module offers a 12MP APS-C CMOS sensor but, unlike the existing modules, it has a redesigned microlens layout designed to better cope with the wide range of lenses that could be mounted on the camera but, more importantly, it has no low-pass (anti-aliasing) filter. The company says it feels it is more important to convey the full characteristics of the lenses than to suppress moiré."
Note that this isn't a completely new camera, just a new sensor and lens module that plugs into the rest of the camera.
It would seem that Ricoh is the first to come to grips with the sensor being a "replaceable" part of the camera - afterall, I don't necessarily need a new thing to hold, just a new thing that captures light!
It will be truly fascinating to see how this product line continues to evolve.