New beta is out, with file change detection thrown in. I've updated Packages/Default/Options/Default.sublime-options with comments on the available options, the new ones are:
Set to true to never prompt to reload when a file is changed on disk
Set to true to always reload changed files on disk, instead of prompting
The ability to word wrap at a specific column and to render in the centre of the text area is available too, configured by the options:
Set to a value other than 0 to force wrapping at that column rather than the
Set to true to draw text centered in the window rather than left aligned
OpenGL is now supported as an alternative renderer to Direct3D, you can activate it be adding --opengl on the command line. It's not recommended to do this in general, unless you're having D3D driver issues.
The other changes are all to do with the API, it's best to check out the API Reference for the details.
Via the new API calls, you can set options with the console: Enter "view.options().set('drawCentered', True)", for example, to see the new drawing in the middle of the page in action.