We'd heard rumors about this back when mobile 802.11n WiFi chipsets began to announced, and when the next gen iPhone was said to be "faster". Now Apple Insider is reporting that:

Wireless radio component specifications contained within the iPhone 3.0 firmware indicate support for a new chip enabling low power 802.11n, which is likely to be exposed in the new iPhone and iPod touch set for release later this year.

Along with faster CPUs, faster GPUs, and faster cellular networking, 802.11n Wifi, anyone think speed isn't the name of the game Apple's playing with the next gen iPhone?