Just sold my 2011 13 MBA today. I have to meet with the buyer tomorrow and close the deal after restoring the computer to factory settings. Im planning on buying a 2012 model and using migration assistant to restore from a time machine backup. The problem is that I will be getting the new MBA in about 2 - 3 weeks. If by then MBA´s ship with Mountain Lion installed will I have problems restoring from TM which was done on my current MBA running Lion? Thanks!