Judging by the errors I'm seeing on calguns, it looks like the migration isn't going as smooth as it could. The 503 errors and raw data errors indicate an issue with compatibility. I'm surprised they didn't do test migrations before hand then just do a flip once they got the process done.
I also did a pretty comprehensive comparison vs vb6 cloud and what we have. The feature differences between the two are night and day. I'm 100% certain, we'll have more to offer users who are accustomed to modern websites at least in features. From a community aspect, the area we lack most is the history, experience, and knowledge. That will be decided by the community and who decides to participate and share their wisdom here.
Hope they get it sorted soon. I'm also very curious to see how the vb team will handle the traffic. I think the overall performance should be better once they are done, but its going to look/feel very different.