The list of supported sites in the "Add Media" dialog has been limited to 40% of the screen's height. If that's not enough to show all the sites there should be a scrollbar unless it's suppressed by the browser.
Videos are back to being displayed as a standalone video player, now in a dynamically-resized iframe.
Pastebin has new URLs apparently. Also, this release contains a CSS fix for the sonnb XenGallery extension.
ESPN moved from http://espn.go.com to http://www.espn.com. Some older URLs may become unsupported.
Links to TED Talks transcripts are now ignored.
VK updated some of their markup.
Added support for non-ASCII usernames in Google+.