It's usually easier to find photography gear in Japan before the US, but the Sony A57 may be the exception that proves the rule. The SLT camera was originally set to come out on April 13th in Japan ahead of the scheduled US release of "around" today, but Japanese customers will now have to wait until the 27th. A Japanese delay for a Japanese camera would normally mean delays around the world as well, which was certainly the case during the NEX-7, A65, and A77's production woes last year, but we're unsure of how long people in the US will need to wait for the A57.
The camera is apparently in stock at Adorama and B&H, Amazon lists a ship date of "between 3 to 5 weeks" for the body and says that the kit may require "an extra 1 or 2 days to process," and Sony's own store gives an estimated ship date of April 23rd. It doesn't look like anyone will have to wait too much longer for the A57, but those of you considering a purchase today should know that it might not be easy to find right off the bat.