The best thing about this new beta is speed — it's 25% faster on our V8 benchmark and 35% faster on the Sunspider benchmark than the current stable channel version and almost twice as fast when compared to our original beta version.
Getting on the beta channel means your version of Google Chrome will regularly get updated with new speed enhancements, features, and bug fixes before most users see them. We're doing our best to quickly churn out new features as they are available rather than saving them up for occasional major releases. Riding the beta channel is a great way to let us know about what's working and what's not, but don't be surprised to find some rough edges. Also, if you're looking for an even earlier (and rougher) sneak preview of things to come, you can always move to the developer channel.