Currently, the automatic background updating that Google has been testing in beta builds is disabled by default in the stable edition. Not included in today's updates is Google's planned integration with Adobe's Flash Player.
Google maintains three separate 'channels' of Chrome: a finished, stable build a beta build and a developer preview. Google also updated Chrome for Windows - which has been in the stable channel since December 2008 - to the same version number, marking the first time that all three supported platforms carry the same designation.