First, the Communities section now allows you to switch between New Communities and Favorite Communities. Second, when you click on a Community there is now a button to Favorite the page, go to the eShop, or set preferences for that specific Community. As well you can switch between New Posts, Popular Posts, and Other Communities (This is not out yet but is visible. Iwata taked about this in the last Nintendo direct. These will be USER created!). Finally, when you go to post something it will show all emoticons at once!
These are some nice little changes that help connect apps like Miiverse to the eShop, as well as showing off the very cool posts, and even though its not out yet allowing for my user created content!
I do not take credit for the photo or video I got them from the sites listed below.