Today, I received an email from vBulletin about the new version 6 (X.x.x). I took a quick look, but as a user, I don't see a significant change. The interface design remains the same, including the tabs and panels.
I haven't delved into the specifics of what has changed in the underlying code, but I believe that changes of this nature (at least those mentioned by vBulletin) would be considered minor updates here at XenForo, represented as x.X.x, and not major ones.
I agree that nowadays, there isn't much left to innovate in forum interfaces, but at the very least, with major updates (X.x.x), I would expect a refresh in the design as well.
I haven't delved into the specifics of what has changed in the underlying code, but I believe that changes of this nature (at least those mentioned by vBulletin) would be considered minor updates here at XenForo, represented as x.X.x, and not major ones.
I agree that nowadays, there isn't much left to innovate in forum interfaces, but at the very least, with major updates (X.x.x), I would expect a refresh in the design as well.