Originally posted by ofer4 This may explain the 6fps burst limitation.
The limitation could also come from the camera electronics.
The Sony A77 does 12 fps, so doing away with the mirror can certainly help to increase fps if one uses a shutter and electronics which are up to the job.
Regarding vibrations: Eliminating mirror vibrations is good, but for instance on the K-7, the shutter was responsible to cause image blur in a certain shutter speed range. Falk (falconeye) wrote an
extensive report about the issue and the problem was reduced (not entirely eliminated in the K-5).
P.S.: Supporting 1/8000 calls for more expensive shutters. The shutter has to maintain a slit width of less than a human hair while moving with a non-uniform speed.