It never was officially announced, as in an "announcement" thread.
The information was kind of flowing through threads as Mobius is one of the higher level Kickstarter pledgers and got to name a station.
His station is
"Rafferty's Mobius" in the Azrael system, which makes it kind of our home base.
It is in the middle of Empire space if you don't mind that
, and there are always group members around.
With the instancing in the game, you will never see more than 31 other commanders, but that is already a lot and never happened to me, yet.
(Max was 18, if I remember correctly)
As the group is growing and with the wings expansion, I think it is not only inevitable, but also a good idea, to form some kind of subgroups like in our "Wing Commanders" forum. There you can form or join wings, fleets, subgroups or whatever you like to call them and these might have their own home base.
Have fun and fly safe.
Wolf