Looks like the "line" is to get in.
I think that is the one on 37th and 6th ave. It has had a queue like that at lunchtime since the day it opened. They do move you through it very fast, but more often than not when I want to eat there I go somewhere else due to the line.
I am trying to picture where this new one is? AFAIK the only thing at 1 World Trade is the Freedom Tower. It must be located nearby if it’s only 5 stories and has rooftop access.