Yes, it's not 4/3rds, but you can now buy a Samsung NX100 that is lighter than all the 4/3rds bodies, if perhaps not as well-built. The benefit is the APS sensor is coupled to some really good lenses, especially the primes they have. The drawback is that Samsung's sensor is the noisiest of the APS bunch. This is an NX10 shot, 100 ISO, that is their small mirror EVF camera, kind of like the G1.
P.S., the viewfinder on the NX100 (clip on) is by far the WORST I've ever used. A toy, basically, and the camera's focus is slow. But it would be very good as a pocket camera coupled to the 20mm or 30mm primes.