It's not a new release, it's the beginning of development on a new version because they shipped the old one. This is no different than any other development process ship cycle, one of the first things you do after you ship is rev. the version number for new development. That doesn't mean there's any substantial feature difference, the unusual bit when it comes to chrome is the dramatically open development process of the dev team, which gives anyone in the world the ability to install what are basically automatically updated daily builds just by selecting one radio button over another.<p>By the time that version 5 actually ships it will certainly have new features.