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Will the mid-2012 Macbook Air models be compatible with the MagSafe power supply of the previous generations?

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up vote 7 down vote accepted

Electrically yes, physically not without an adapter.

Only the physical layout of the pins and metal end that connects to the Air is different. However, with the MagSafe to MagSafe 2 Adaptor ($10) lets any original sized MagSafe adapter slim down to work with the new thinner Mac-side of the MagSafe 2 connection.

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If I would want to be pedantic, I would ask how do you know what the pins are, that the $10 adapter is, indeed, just wires. But, obviously, a $10 adapter from Apple that small can't really contain any power circuitry. – chx Jun 14 '12 at 22:05

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