Japan still lags behind the US for most big-ticket films. Avengers won't open here until 2012/08/17, more than three months after the US release date. [1] That's a month ahead of the projected blu-ray release of the film though.

It's really hit and miss, but most of the more major films lag by two to three months.

1 - http://ja.wikipedia.org/wiki/%E3%82%A2%E3%83%99%E3%83%B3%E3%...