Beta 20091023 is out, with Goto Symbol and a change to the default color scheme being the most visible changes. The color scheme now uses an orange highlight, to make the selection more visible. I like it, but I'm keen to hear opinions either way. If you're not seeing orange selections, it'll be because your color scheme is set to 'Monokai' rather than 'Monokai Bright'. Also on the color scheme front, the color of the bracket matching underlines can now be configured, by adding a value for 'brackets' in .tmTheme file.
For the API, addRegions has been extended to take an optional set of bit flags, the possible values of which are:
Let me know if it's not clear what these are doing. There's also a new callback available for plugins, onSelectionModified, and a new flag for the quick panel, sublime.SELECT_PANEL_MONOSPACE_FONT, which is handy if you're embedding formatting into the quick panel entries, a la CTags plugin.
For the full list of changes, have a look over the beta page.