iPhone 3.1 Beta 2 Breaks AT&T Tethering Hack, Allows Wi-Fi Testing, Intros Augmented Reality APIs?

Following up on last night' release of iPhone 3.1 Beta 2 firmware and SDK, developers are finding more changes and new features.
- TUAW reports that the AT&T IPCC hack, where the carrier file was modified to allow iPhone tethering sans official AT&T sanction no longer works. Bummer, given AT&T still hasn't announced anything about legitimate tethering support or pricing.
- Engadget Mobile's been informed that new APIs have been introduced allowing for the manipulation of live video to produce "augmented reality" apps (where information is layered on top of the video).
- Ars Technica reports iPhone 3.1 Beta 2 allows developers to connect to test devices via Wi-Fi, rather than having to tether via USB as in previous releases, and still access instruments and other features.
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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.