Some of their team want it to remain how it is, or in details, make dde-kwin (as their github repository name) compatible with new kwin versions as what that meant to be, and provide little customization options.
But yeah some others still would like to fork kwin, actually coming up with this all day. If that really happens, I don’t really see a way maintaining it in distributions like Arch as the gap between their stable KDE libs and Arch would be too big to fill and that work would most probably end up left on me alone.