Judging by other reviews, the Region 1 disc is similar in content, but only contains additional language options. Also, the video bitrate is considerably lower at only 4.5Mb/s. Region 4 misses out on:
No big deal there, but in comparison to the Region 3 Hong Kong disc, Region 4 misses out on:
The Region 3 disc does not contain any commentary or featurettes. If I were you, I'd wait for the Director's Cut.
UPDATE- May 2005: The Region 1 Director's Cut includes: