It’s not open to the public yet, but according to one tipster (who goes on Twitter by @steadyblogging), the interior is now visible from the 2/3 turnstiles. Very futuristic—in a 1980s kind of way.
Atlantic Terminal Station May One Day Be Complete! [Brownstoner]
Development Watch: Atlantic Terminal Station [Brownstoner] GMAP
Atlantic Terminal Station Gets Glassy [Brownstoner]
Atlantic Terminal Station Starting to Show its Face [Brownstoner]