Earlier today we heard the next iPhone will likely have a 3.2 megapixel digicam, and two days ago Apple Insider discovered both the next-gen iPod touch and iPhone will likely support 802.11n WiFi. The site says the iPhone 3.0 beta firmware contains references of a low-power 802.11n chip with Bluetooth 2.1 + EDR support from Broadcom.
Wireless radio component specifications contained within beta distributions of iPhone 3.0 firmware reveal support for a new chip enabling low power 802.11n that's bound for Apple's third-generation iPod touch. It's therefore also likely to be included with new iPhone models.
The version of the existing Broadcom chip that supplies WiFi and Bluetooth on existing models jumps from BCM4325 to BCM4329, according to resource files reserved for a third-generation iPod touch. The component upgrade adds new support for 802.11n features, including the ability to find and join 5GHz networks.