Users familiar with Google Chrome dev (Windows | Mac | Linux) will find the beta lacking mostly minor and under-the--hood changes from the developer's build, although users can expect that to change as new features migrate from the bleeding-edge Chrome Canary build into the developer's version. However, the built-in PDF reader plug-in that currently ships in the developer's build is not present in the beta.
The new beta does include the form autofill feature, and autofill synchronization. Google said in a blog post announcing the beta that it will not insert the form data without user confirmation. This includes credit card data, which will explicitly prompt users to fill in that data in addition to the regular autofill prompt. Extensions in the beta are now synchronized, too, along with bookmarks and user settings. Interface changes include detaching the stop-refresh button from the location bar and giving it its own button on the left side of the interface, and merging the options menu to create more space for extension icons on the right side.