2011 has just been released. I've been reading that you can copy the newest mapset to the previous version eg 2011 to 2010 MSDN version and it'll work but you have to know which files to copy over. Unfortunately, your auto construction update no longer works but you can download it manually and install it in the construction update directory.
Does any one know which files to copy over? You can get 2011 trial from Microsoft's website: [Only registered and activated users can see links. ]