Hi-Rez Studios just updated their Answer Center with new Global Agenda beta information. The game is expected to move to a Closed Beta phase this July. Global Agenda has been in Alpha testing for a number of months now.
It looks like they're sub-phasing their Closed Beta Test as well (e.g., CBT-1, CBT-2, etc.), an approach that seems more common in MMOs these days. Warhammer Online did a series of closed beta phases, and more currently, Aion is doing the same. Each phase focuses on a different area of the MMO that needs testing and each successive phase usually brings more testers to the mix.
There are pros and cons when taking this phased approach. On one hand you really get to hammer down on your areas of concern but on the other you're only testing the individual parts and not the whole. Players always seem to play a game differently when unleashed upon the full experience.
In the end though, it probably won't matter to all the people who want a taste of what Global Agenda has to offer. Winning E3 Editor's Choice awards like "Best of Show 2009" is definitely building anticipation and raising expectations for this title.