I noticed today that the new format is gone on my account and the Account and Activity (bell) are back.
It says I am on 6.149.0.
Has this changed back for anyone else or just me?
My changes to new format happened on 6.148.0. Then I upgraded to new version; 6.149.0, and I still have the changes. My point is these changes did not come with a version, but rather they seemed to push with certain users, similar to how a 'patch' update would come . I even logged out and back in and no change. I don't clear cache in general, so I did not try to do that, but I doubt either should expect a reversion.
Tomorrow is another day, so who knows what it will bring.