Last issue ended by promising to unveil a new Avengers HQ; while Quicksilver and USAgent are off investigating some Inhumans-related business, everybody else takes a look at the new base.
This segment begins with the team (most of it, anyway) still standing in what looks like the old HQ; Cassie notes that this may just be a blonde moment, but things don't look that different. Herc agrees. Hank beckons everybody through one of the doors...
I'm not sure that look of imperious malevolence is the best way to keep your disguise, Loki (though that's well in keeping with his actions in Thor, I suppose, where he walks around like a cackling supervillain and nobody noticed until it was far too late).