My understanding is if I buy a new mac now, it will come with Lion installed, and a code to get a free upgrade to ML when that is released. If I don't buy a new mac, and just upgrade my old one, the one price I pay will let me upgrade all the macs I own (just like the upgrade to Lion did). So my question is, if I buy a new mac now, will its inclusive free upgrade to ML only apply to it, or will it let me upgrade my old mac to ML too?