Dev Build 2092 is out now. This is primarily a collection of fixes that have come to light since the last regular build.
The behavior when opening files from the command line has changed a little when used in conjunction with virtual desktops (Linux) or Spaces (OS X). Previously, if a window wasn't open on the current desktop, one would be created. Now, files passed on the command line will be opened in the last used window irrespective of the desktop it's on - this is especially important on Lion, where full screen applications get allocated a Space of their own. You can force a new window to be created on the current desktop via the '-n' parameter.
There are a pair of new API functions on the Settings object, add_on_change(key, callback) and clear_on_change(key). on_change callbacks are run when any of the settings has changed, either due to the underlying file being reloaded, or set() has been called.