As noted by Erica Sadun at TUAW, Apple has updated the push notification system for iOS devices with enhanced security. Push notifications now have more secure 2048-bit TSL/SSL certificates.
The upgrade requires an updated server certificate, and Apple has recommended that developers test and validate communication channels to avoid any outages. Full details are available on the iTunes Connect developer site.
In addition, Apple announced that iTunes promotional codes can now be used overseas. Previously, those codes could only be accessed through the iTunes Store in the U.S.
"This [change] particularly affects applications where English is not the primary language for use or U.S. customers are not the central audience," Sadun noted. "Now, developers can send review codes to local newspapers, magazines, and blogs without having to request that those outlets create U.S. iTunes accounts.
Finally, some high-definition movies have begun to appear for the first time on Apple's U.K. iTunes Store. As noted by MacRumors, the library of titles is limited at the moment, with the most prominent title being "The Twilight Saga: Eclipse."
High-definition, full-price movies cost £12.99, while some less expensive HD films run £7.99. Movies first arrived on the U.K. and Canadian iTunes Stores in 2008.