Google launches Chrome beta channel for Android 4.x devices
As you would expect, if you download Chrome beta, you'll be getting access to newer features faster. For this first release, Chrome beta is offering improved Octane benchmark performance of 25-30%, and some new HTML5 features like CSS Filters. You can install Chrome beta alongside the regular Chrome installation if you want as well.
The one trick to Chrome beta is that it won't come up in search results in the Play Store, and it isn't listed under Google's developer page, you can only get to it if you have the link. And, as usual with Chrome, you can only use it if you're running Android 4.0+.
source: Google Chrome Blog