This release has not been tested by many people yet. If you are not comfortable trying pre-release software, don't. It may trash your home directory, kill all the whales, and take your dog hostage.
If you'd like to test it, please backup your data first!. The image handling and document loading were both significantly modified, and since they are the crucial components, you should have data backups.
I posted a longer list of new features and notes over on the project website.
Incidentally, I think I'll start posting news bits over on tellico-project.org and keep blogging about Tellico here at periapsis.org. The news posts there will have comments enabled, too.