It looks like AT&T's new SIM cards will be double-porferated, meaning you'll be able to pop it out along the MiniSIM lines to fit in current and previous generation iPhones (and most other phones), or along the smaller MicroSIM lines to fit the iPad Wi-Fi + 3G and if the leaks are correct, the 4th generation iPhone to boot.
The two SIM card sizes have always been compatible and we've heard for a while that jackets would let MicroSIM's work in MiniSIM devices and that brave souls could grab a knife and cut some plastic off MiniSIM's to make them Micro, but AT&T providing an official solution is all shades of awesome.
(Just keep in mind if you snap out the MiniSIM now, you can come back and snap out the Micro later. If you snap out the MicroSIM now, you might need some duct tape to get the rest of plastic back together later).
The new double-porferated SIMs aren't in stores yet, but should be soon.
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Rene Ritchie is one of the most respected Apple analysts in the business, reaching a combined audience of over 40 million readers a month. His YouTube channel, Vector, has over 90 thousand subscribers and 14 million views and his podcasts, including Debug, have been downloaded over 20 million times. He also regularly co-hosts MacBreak Weekly for the TWiT network and co-hosted CES Live! and Talk Mobile. Based in Montreal, Rene is a former director of product marketing, web developer, and graphic designer. He's authored several books and appeared on numerous television and radio segments to discuss Apple and the technology industry. When not working, he likes to cook, grapple, and spend time with his friends and family.