Is there really going to be a Gundam Seed Eternity

No, Gundam SEED Eternity was a rumor started by fans when the second series ended. It's seen as a comical name, chosen based on the second series being called Gundam SEED Destiny. While there is no full 50 episode sequel to Gundam SEED Destiny, Sunrise has confirmed at the Sony Music Anime Fes' 06 that a movie is currently in production which will feature the main SEED cast--Kira Yamato, Athrun Zala, Lacus Clyne and Cagalli Yula Athha. This is reported to be the first completely original Gundam feature film since Gundam F91 15 years ago.