Q: When will Galactic Civilizations III come out?
A: We don’t expect it to be ready for release for quite a while. As of this writing (fall 2013) it is in internal alpha testing. We expect it to go into the Founder’s alpha early next year and a public beta soon to follow.
and:
True Galactic Civilizations superfans can purchase the Founder’s Elite Edition, which comes with alpha access (coming this winter)
(well early next year is still winter)
https://www.galciv3.com/game/faq