The new box art is nice, but i would agree it would not necessarily mean that we're into C3 now. "A new design" can be just aimed at the box art, which has changed a lot in C1 and even in C2.
In terms of box art, it would be the 4th edition of C2
We've seen 1 webshop calling it a "New Edition", and they did mention a revised rulesheet and more detailed tiles.
I'll wait to see what HiG/Cundco call it if/when they release the new base game&BB7. If they call it a "New Edition", i'd be more inclined to go with C3 for it. If not, i'm happy to stick with C2.2
In terms of how to list it in the profiles, i would suggest waiting for the same. If HiG call these C3, let's follow that. If they don't, then just list BB7 under the C2 section.
We don't have separate entries for different box arts, or special/limited editions of things. Carc20 would be understandable to list, as it brings a (so far) unique expansion&river.
And i wouldn't list the mini's separately until they can be purchased from a publisher separately. We don't have them listed separately from BB6 either.