Communities will let established authorities in all sorts of disciplines and hobbies be rewarded for that expertise by people who recognise them as such.
This also "cleans up" the rewards a little as well as people who care will spend their time there, while those who don't, won't.
I am hoping that thre will be easy to setup and customize community interfaces that are practical and attractive. The tools for the end user have to be relatively easy to build with. I am haven't heard much from TokenBB, but I think that it would be great to use as a base for communities.