Both the Mac and iPod pages get products that fly in and bounce into place and the menu on all pages now drops down into place and in general looks just a touch darker.
Since HTML5 has been renamed simply HTML there's no super cool technology term for what Apple's done other than adding eye candy. They do have a long history on the iPhone of using animation to help mask transition times and provide extra orientation information. I'm not sure the new Apple.com counts as a functionality improvement though. What do you think?