The huge MicroFourThirds tecnology success will shortly move other competitors to release cameras with the same or a similar concept.
Nikonrumors found a new Nikon patent for a mirrorless camera system. Zeiss will probably not make any digital rangefinder camera. Latest report are saying that Samsung delayed their first NX camera release. Chasseur d’Image magazine predicts a Leica M9 in September. There are no reliable reports about possible Canon and Sony moves but I suspect they are working on mirrorless cameras.
The only thing we know is that Olympus and Panasonic both will soon release new MicroFourThirds cameras 😉