NewType magazine released some specific information pertaining to the 3 episode OVA Gundam Seed Destiny Special:
Mobile Suit Gundam SEED C.E.73 Stargazer will be a 3-episode OVA taking place immediately after the "Break the World" event (The event that led to the start of the war in Mobile Suit Gundam Seed Destiny).
The three episodes will be 15 minutes each and will be released online and screened at Gundam related events in Japan. The first episode will premiere at the Shizuoka Hobby Show in May.
A domain for the future official website for C.E.73 Stargazer has been registered at seed-stargazer.net however the URL currently forwards to Sunrise's main website.