I am very late on this sorry. My plane just got in 2 hours ago and I'm just sitting down now. Anyway, I am going to keep this short since the chapter was kind of short and I have stuff to do.
So we see that the Vandenreich travel by means of some weird shadow thing. This is likely how they got into Soul Society without anyone noticing. Chojiro is still alive and reveals that the Vandenreich can all seal Bankais. Im wondering who they did this on. Will be interesting to see where that goes.
We now know that Ivan is indeed a part of the Vandenreich and that the others look less Arrancar like than him. And the Ice Palace has now been revealed. So the Vandenreich are definitely the new enemies that Kubo stated would threaten the entirety of Soul Society. Im looking to see how this unfolds.
Anyway, as always, comments are very welcome, just keep them clean.