The new version is build 10A421 and weighs in at about 740 MB.
This Snow Leopard Developer Preview Update is recommended for all users running the Snow Leopard Developer Preview Build 10A411 or later. This update includes general operating system fixes for stability, compatibility, and security.
9to5Mac reports that Apple has included a new QuickTime icon, new backgrounds, and a finalized Darwin kernel.
You can find a gallery of the backgrounds here
New icon is below. What do you think?