Unless they actually came out in japan and dark horse just decided not to bring them stateside. The other complaint i have is they reprinted it backwards so it could be read left to right, rather than right to left. The same thing was done with miyazaki's manga Nausicaa of the valley of the wind. Thank god the publisher of that book series viz comics actually reprinted it in the traditional japanese format in english after getting many complaints.
The image on each page being flipped or mirrowed, is such an anoyance i've actually considered getting the original trilogy manga from japan from mediaworks even though i can't read japanese, and the cover art is better than the u.s. release, and of course the comic frames match up to the way they are on film rather than reversed.