Yes it is here finally, well nearly.
Firaxes and 2k are going to release the new version of civ rev on July 2nd, for iOS and android.
The game will be the first civ rev game to come after the release of Civ 5 so hopefully this means that it might share some characteristics with civ 5, a bit like Civ 5 for mobile (yes it actually existed).
The game from what screenshots have released will have updated graphics new game mechanics and so on.
One thing I was very surprised about though was the fact that it was not coming to PS4 and XBOX one, at least for now
So it seems first of all that beyond earth (the new civ game) will be official released somewhere in september, a clear date has not been given yet but judging by the last release dat of 10 September or Civ 5 it will probably be released again early in September.
Then most likely it will be released a bit later for Mac most likely a month later. For OSX the likelihood that it will include snow leopard in the system requirements will in my opinion be quite low.
For Windows it is hard to say but I think that Vista will also be dropped for the new Civ Beyond Earth game.
So in the end my prediction with using facts is:
Windows Release: September 10th System Requirements Windows 7 and higher
OSX Release: October 22nd System Requirements OSX 10.7 and higher