I assume that this means that versioning of CSS / JS files now works - one of the problems I've experienced with Cloudfront is updating files that don't normally change very often (eg CSS). As Cloudfront doesn't support query strings, changing version number of the following didn't work: stylesheet.css?ver=201200505, but now it should.
We've just been using mod_rewrite to rewrite stylesheet_([0-9]+).css to stylesheet.css for our CloudFront stuff. Our build scripts pop in the file modification time, so CF sees a new URL any time we update a file.
