*Apparently* 3.8.0 has some neat features and while I have no idea what half of them actually mean, I'm sure you guys will find a practical use for them.
Onward:
* Social group discussions
* Social group categories
* Private message sorting and filtering
* Private message history
* Quick edit for newer types of content (visitor messages and picture comments)
* Social group icons
* Social group transfers
* Private message quick reply
* Private message throttling (limit messages sent over a time period)
* Private message reporting
* Profile privacy (limit blocks to a subset of users)
* Lightbox navigation
* Thread prefix permissions