The 13" non retina June 2012 MBP originally came with Lion. It won't run anything older than that.
That's actually not 100% on the mark, Jon.
A while back, tacit reported buying (I think it was) an MBP that shipped with either Lion or Mounty but was capable of running Snowy.
It had something to do with the later machine having the same architecture as an earlier one, but how anyone other than tacit would figure out such a thing is beyond me.
But aside from unusual instances such as that, you're more than likely correct in saying that a
new current machine will not run Snowy.
