Not sure about what code it will come with, but my advice is enjoy the code for a while before you upgrade. It's sometimes special to upgrade to a newer code version, but if you never experience the older versions you might not appreciate the update as much or there might be some code aspect you like in the older code.
But try to get as many code versions on your computer or memory stick as possible, at least I have found with XM it's sometimes interesting to go back to an older version for a Laugh or sometimes there has been some music or animation that doesn't make the final cut but is cool nonetheless.