Not sure how the specs would indicate a major step forward as Sony are retaining a 16Mp sensor (good decision IMHO) but not introducing the A65/A77 EVF. I notice the sensor is listed as ExmorHD. Swifel screen is clearly swivel screen.
What we know so far about the A57:
16 megapixel ExmorHD sensor
100-16.000 ISO (up to 25.600 with MultiNR)
Same menu and focusing of the Sony A77
No top LCD
New battery grip
Not the same EVF as the A77/A65
Apparently the price will remain the same as for the A55.
I might have been interested had I not invested in NEX for my "light outfit" . I think it is a step back if they retain A55 EVF, but perhaps the A65/77 EVF is too expensive for this level of camera.