A Sony Press Release contains the following announcement of what it will be showing at PMA (I quote):
- Concept model of an ultra-compact interchangeable lens digital camera system that packs the quality of a DSLR camera in an extraordinarily small body, along with interchangeable lenses
- Mid-range concept camera for advanced users (a successor to the A700) as well as concept mainstream models
- Prototype of a Super Telephoto Lens (500mm F4 G) with class-leading optical performance
- Prototype of a Distagon T 24mm F2 ZA SSM, new Carl Zeiss wide angle lens for superior shots of landscapes and sweeping vistas
End quote. The Sony mirrorless cameras will apparently not be part of the Micro 4/3 standard, but will use Sony's APS-C CMOS sensors. And how about that last item? At long last, a fast "normal" lens that would be slightly wide on APS-C (although I don't know whether it's a full-frame lens or APS-C only). Can't say I photograph too many sweeping vistas, but I sure am interested in an example of the notorious "missing normal" that has been so conspicuously lacking in modern digital lens lineups.
dpnow.com has some pictures of mirrorless camera mockups, for what that's worth. They look to be wooden models, so don't expect the look to survive into production cameras.