As I decided about my gear I ended up with Nikon’s D90.
Nikon failed so far on me by not delivering a D300s successor (D400). The D400 will be very likely to use the same sensor like the A77, but will there be much to ask?
The weakness of Sony’s line up had been the lenses - either mediocre or quite good, but overpriced (Zeiss lenses). The combination Sony just announced seems to priced of what I expect to be the price of a D400 body.
If the image quality of the new combo will hold up against its technical parameters, Sony has a killer here