I've heard about the communities as well. I believe it's coming in the next hardfork ? It's quite hard to say or imagine how it will look and how will it serve to steemit but I think it will be a good addition to steemit. Content will be labeled a bit more I guess and it will be easier to find what you're looking for. And for example, if you don't like seeing anything related to crypto currencies, you won't have to see it anymore because you will be in communities that cover different topics.