In this release, I'm trying to fight blog comment spam and trackback spam with an integrated Spam scoring rule-set. I think that all frameworks will integrate anti-spam engines by default in 2008. Currently, the only solutions are plugins for various end-user applications (MT, WP, etc.) I also think this would be a reason that more people would use PHP frameworks instead of thinking that they don't offer anything out of the box.
Other features in this release: