That top set looks like something on Corusant. I wonder if the fact that the FO attacked and destroyed the New Republic (which had moved to a new planet )was simply a scripting slight of hand to spare Corusant for the future episodes, given the history of that planet in the SW universe. When in TFA the NR planet was first destroyed I assumed it was Corusant , which had always been the seat of power and its architecture looked so similar, at least until I learned differently. Afterall JJ wiped out Vulcan in ST .
I had also assumed that the New Republic would reform the Senate as it had been previously on Corusant and couldn't really figure out why it had been moved. But, if it turns out there are a lot of essential things to happen plotwise including the old Jedi council building and otherwise on Corusant ,sparing it by wiping out another ruling planet makes sense and it could be very much more interesting. Certainly if Corusant itelf has declined economically because the NR moved from there and it was no longer a seat of power and trade ,then it would be a much more interesting place to visit. Perhaps Snoke has moved back there (or has never left) But that's all speculation on my part. Certainly the island is looking very interesting.
