Click on them.
You can find descriptions of *some* of the new stuff in a few threads in this forum - late November, early December. There are only a few of them, so they should be easy to find.
Most of the upgrades are behind the scenes stuff that you guys won't ever even see. My personal favorite is the hack I added to help control the spam. It's AWESOME and has cut out at least 90 or 95% of the garbage spam that used to get through.