Gundam EX A [Gundam Ace 10th Anniversary Project] begins in Gundam Ace (July Issue)
This manga project is sort of like the Kamen Rider Decade series for the Gundam universe, where the main characters will meet characters/MS from different Gundam series in the story.
Lead characters are Leos Aroi, Cecilia Awaa, and their Haro. They will traveled to a Jupiter base called 'Jupiter Answer' or 'GA', where it contains a huge database about the history of humans. The story is essentially about these characters going into GA to collect data necessary for the evolution of mankind. Hence, they are called G divers, since they dive into GA to find these data. In this month's Gundam Ace (July Issue), they will confront Gai Maurakumo (Gundam Seed). And in next month's Gundam Ace (Aug Issue), they will meet characters from Gundam 00.
And on a seperate note...here are a couple of misc. images for the August Issue of Gundam Ace - Gundam Z Define manga:
*Thanks Sieghart for the heads up on the Gundam EX A info*