It turns out there is a second Gatchaman movie coming out! Its a live action movie, scheduled for 2009 or 2010 release. This is separate from the CGI version and being done by a different company. I hope one of the movies does the cartoon justice.
http://www.chronicsite.com/gatchaman/images/1stPromoSheet.jpg
http://www.chronicsite.com/gatchaman/images/1stPromoSheet.jpg