This rumour fits in with something leaked to me from Australia just after the A900 was launched. An A900 pre-release trial photographer mentioned that Sony's Australian exec/s had hinted at ultra high speed action (he said up to 50fps) and a mirrorless, shutterless shooting mode. I didn't place too much weight on this leak, as it sounded similar to some others based on the smaller Sony sensor used by Casio for ultra-high speed. This was rumoured as an A700 replacement, not A200/300. What would be amazing would be full resolution 30fps for very short bursts - 720p for continuous filming, but bursts of maybe 10 shots at 12 megapixels.
The specification for the IMX021 was 10.5 fps at 12 megapixels, maximum. So, call it 20 fps at 6 megapixels and 40fps at 3. 720p is barely 1 megapixel, it should not present any real problem getting 24/25/30fps or other required speeds.
If they could make an EVF with 100Hz refresh and 1200 x 800 WXGA resolution, it would be almost as good as an optical finder.
They could call it the A720 and that would make complete sense
David