CNET’s MacFixIt:
If you’ve taken a look at Apple’s sneak peek of its upcoming revision to OS X, you might wonder if your system will be able to run the operating system. In recent versions of OS X, some requirements have resulted in older hardware no longer working properly, including the drop of PowerPC support in Snow Leopard, and Lion not installing on some of the earliest Intel-based Mac systems.
Unfortunately Apple has not yet officially released the system requirements for the new OS, but the developer release that is being issued to members of its Mac development community does contain a list of supported devices.
That list really isn’t that bad. Assuming that it remains the same when ML ships, it will support machines that are more than five years old. Which is absolutely elderly by Apple standards.
Much easier to say if you’re not saying it from a MacBook Pro (Late 2006) and/or can afford to upgrade soon… But if I’m to be honest with myself, I guess I have to admit that it’s impressive that Apple is supporting _some_ Macs that are more than 5 years old given the pace they’ve set for OS X.