FWIW, I use Colin's method of access, so it is also irrelevant for me - but I have great sympathy for everyone else's points of view and can see a strong case for both approaches. Having a second set of boards for the new release seems like a good idea, though. Even if that reflects the current layout!
While you are at it, would it be possible to look at the wiki too? I often find that when I'm looking around it, I find things are not yet supported, then later discover the page is out of date and it is now supported in 7.x or whatever.
I'm not suggesting re-writing the whole wiki (far too much work!) but how about introducing a header to every page? This header would be a table listing the various versions of MCE and whether the page applies or not. Users would then be encouraged to add the header (and fill it in!) when editing a page. Any page without a header would then be "flagged" as pre-8.10.
Alternatively (or maybe as well) you could have a "Applies to 8.10" logo which is added to any page that is updated in the light of the new version.
One (or both) of these suggestions would prevent people (like me) asking questions relating to outdated wiki information...
Just a thought