SGG prohibits images and video from beta, but allows discussing it. I and other beta players routinely answer questions about beta on the Forum to anyone and everyone who asks.
Major features like the Raid Tournament also have had extensive public discussion on the public Forum while still in beta. That will very definitely be the case for the new buildings too, whenever they come to beta.
To be clear…it’s not.
The building you’re talking about is what Tim referred to in the AMA as the Hero Academy.
That building has not entered into beta in any form whatsoever — last I heard, they hadn’t even designed or programmed it yet.
Tim also explicitly said he expects a lot of feedback and changes in beta.
So, in upshot: anything whatsoever you’re reading about it now is entirely speculative.