Wireless-N has been in development since 2001 and various Draft-N Routers/Wireless Cards have spawned in 2007. Today, the IEEE LAN/MAN Standards Committee have confirmed that Wireless-N is finally completed!
For those that have Draft-N equipment, they will be compatible with the new hardware. For those unfamiliar, Wireless-N is said to be the bridge to achieve Ethernet speeds using OTA(Over the air) frequency modulation.
Check out the link for more info.