A recent job opening which was posted on the Apple website may hint at the possibility of 802.11n WiFi in the next gen 
iPhone.
It has been suspected that the iPhone 4G would support 802.11n WiFi since the third generation iPod Touch was found to contain the Broadcom BCM4329 chip, capable of 802.11n (but only enabled for 802.11g). The job posting is looking for a software engineer specializing in WiFi protocols to join the iPhone tem.
The job specifications:
* Implementation of 802.11 a/b/g/n & related specifications.
* 802.11i/802.1x Security protocols
* Good understanding of wireless RF technologies & co-existence issues of 802.11 PHYs with other Wireless interfaces like Bluetooth.
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