Made my second visit to Moynihan last week. Since my first visit about 2 weeks after opening in January, I noticed a few changes.
First, the train hall (and NYC in general) was a lot more crowded. Additional new signage in old Penn directs Amtrak passengers across the street to Moynihan. Also on the LIRR (lower) level, all the facilities for the LIRR are gone... the ticket windows, etc, with everything being consolidated at Moynihan. They still have the "connecting concourse" torn apart, but the entryway at the east end escalators is pretty nice. Up on the 7th St in front of the garden/main Penn entrance, its also still walled off. Wonder if the eagles will come back when that work is done. A lot more retail and food establishments in Penn are open again, but the "food court" area which used to house KFC/Pizza Hut is still closed.
I waited for my train mostly in the ticketed passenger waiting area, which was really nice, with old fashioned waiting room-style benches, but equipped with USB plugs down by your feet, etc. (It really makes me wonder why Amtrak spent the money/time to redo the old ticketed waiting area in Penn, knowing Moynihan would replace it). Attendants were checking passengers at the entrances and would walk around alerting you to your train's departure track before it was posted on the boards. A couple small food kiosks are now open in the train hall area, but still plenty of room to move around. The "food hall" is not yet open, with a sign saying "Fall 2021" I believe.
When it became train time, there was a good sized line that had formed, a far cry from my last visit in Jan where there were maybe 4 people in line. People are definitely traveling again, which is good news for NYC and for Amtrak. Down at track level, the train was more positioned to serve passengers coming from Moynihan. Last time it was parked further east. Seems like the train crews know now to spot the train closer to the west end, vs the east end.
My next visit will be in July, if not sooner, when I ride Acela down to DC. With assigned seating on Acela, I won't have to rush to get head of the line, with reserved seating.