If all you want is a new design why not push for a Color customization?
Having a Town Hall level 11 would be nice. A new design yes. But Every town hall comes with an addition of new defenses, collectors, mines, etc etc. unless you want more walls (which I don't think anyone's village has room for 25 more) Other than a new design, unless Super Cell increased the size of the "Town" Then there really isn't anything else left to add. Is there? I might be wrong. Maybe some sort of design/Color customization could be implemented for Town Hall 10's.