That's what Engadget is saying is necessary to hit the 30 days. It's still early and no one has had time to do a thorough review, but I don't get the impression

That's what Engadget is saying is necessary to hit the 30 days. It's still early and no one has had time to do a thorough review, but I don't get the impression that there's anything fundamentally different about the new Air's power management. They've just tightened up the response time and made the SSD standard, so hibernation is much faster.