The possible reason for the SEED/SEED Destiny Remaster releases are that they might finally putting the SEED movie in production. Maybe they're re-releasing it because they want to people to familiarize themselves with SEED.
You guys may be thinking,"Well, it's probably because of the 10th Anniversary for the series." or "Maybe they're adding scrapped ideas to make it better than it already was."
But come on guys, it's been like, 5 years since they said anything about the movie.