Can I pay for an upgrade to Lion and get Mountain Lion free later? I currently have Snow Leopard and do iOS development. I'm wanting to play with the new iOS 6 SDK, but I need to have Lion installed. Is it possible for me to pay for a Lion upgrade now and later get a Mountain Lion upgrade for free later?
No, but you can upgrade right from 10.6 Snow Leopard to 10.8 Mountain Lion when Mountain Lion ships next month (for $20 USD), without having to spend the extra $30 USD to go from 10.6 Snow Leopard to 10.7 Lion.