IMAGI was working on GATCH.
They ran out of money after ASTROBOY bombed (and didn't bring in the revenue they were expecting to use to finish GATCH).
The producer sued to reclaim the rights (and won).
The producer now owns worldwide rights to the franchise.
The producer is currently working on a Japanese Language Live Action Version (which recently released a teaser trailer).
It has been tagged to the stockpage that GATCH only applies to the CGI Western version and since that version is now officially dead, there is really no good reason to have the moviestock cluttering HSX and confusing players (and future players).
http://www.crunchyroll.com/anime-news/2013/01/01-1/gatchaman-cg-feature-film-lawsuit-settled