Redesigned Google Sites Commenting
You get portraits, a better looking design, and notification settings.
Tip: If you don't want the comments feature at the bottom of a specific page, go to More > Page Settings > Disable Comments.
This is a small feature upgrade, but perhaps it will allude to the much more demanded public commenting system people have been clamoring for. I mean, add public comments to your announcements so that it acts more like a blog. It's been difficult to integrate Disqus to Google Sites (can be done but looks pretty clunky). In the meantime, this is nice for those who are already using the editor/owner comments for improving their intranet. It's like leaving sticky notes for people to improve pages I think.