There are Codes in Beatles: Rock Band Manuals, Why? May 30, 2010

I picked up a copy of Beatles: Rock Band today, bit belated I admit, but I noticed something when going through the packaging.  After discarding all the leaflets about the newly re-re-remastered CD albums of The Beatles looking for the Code for the Avatar T-Shirt, I noticed a string of numbers on the back of the game manual.  What purpose this string of numbers serves eludes me.  The code is too short to be a Xbox Live download code (those are 25-key) and they didn’t fit the required pattern.

Currently, you cannot import your copy of Beatles: Rock Band to any other Rock Band game, could this string of numbers be a loophole just in case they change their mind later on?