The more they poke around, the more is revealed.
There are some wireless radio component specifications in the OS 3.0 beta that will support a low-powered 802.11n protocol. The code, right now, appears to be iPod Touch 3G-specific, but there's no reason to believe it won't carry over to the iPhone as well.
This is significant because current 'Phones and 'Pods support both 5GHz 802.11a networks, or 2.4GHz 802.11b/g networks The 802.11n protocol (as found on MacBooks) also runs at 5GHz, but isn't compatible with 802.11a, forcing users to throttle down to the slower (and more crowded) b/g bands. Native support of the n protocol will allow faster (and cooler) wireless performance — especially with AT&T's anticipated upgrade of their 3G network.