A58 vs A57 and A37 size comparison by AlphaCorner (Thanks!).
They also published the first 18-55 SAM vs 18-55 SAM2 comaprison (Click here). The author said that there is no big difference between the two lenses and that he only found a small image qaulity improvement on the mid range (around 35mm).
As a reminder, tomorrow at 8am New York Time all mjor online stores will accept preorders on the new Sony stuff!