The game has already come out, but as far as I know, is only available on Mac and Windows.
Infinite is a real time game, unlike the turn-based nature of Civilization.
I have put thousands of hours into Civ over its various versions. I tried Inifinite out for a few days but it did not click with me. My plan is to wait and give it a bit after some updates and then try again.
This is almost as bad as the time The Best of Both Worlds left a fan group waiting all summer. Come on with part 2!