I don't think the exact one I bought is up there anymore. I guess if I had been sent to anyone else at the Genius Bar they would have answered that they all ship with Mavericks or higher and then I would have had to make a decision what to do at that time. However, I did d/l a copy of 10.8 that I bought off the website last night (using my computer) and after it is done installing on my USB stick I'll try to start the 2012 up with that so I am certain of my options.
