There may be some GUI improvements:
- Quick-access toolbar added to the main window, providing quick and easy access to some common actions
- The effects dialog will be much more easy and intuitive to use and will allow you to rearrange effects
Also there may be some changes to the way that video sequences are edited in Timeline Mode, which should make it much more intuitive, less destructive and just plain better.
You could expect the next Windows version to be released in the next month or so.