Currently, the software upgrade primarily offers nice features for the administration, namely the fact that some extensions are outdated, broken, or written without any consideration for compatibility with other addons or even the freaking forum software itself.
No, seriously, there are some actual features to speak of. Not all are being utilized, but one that you can use right now is the rich text editor for posts, which allows you to view a few of the BBCode tags in action before you submit your posts.
Many features however are either behind-the-scenes stuff or not rolled out yet, as we have not decided what will be used and what is more trouble than it is worth, and I do not want to promise any upcoming functionality if it might turn out to be the latter.