IEEE 802.11n / The new wireless technology

802.11n. builds upon previous standards by adding MIMO (multiple-input multiple-output). MIMO uses multiple transmitter and receiver antennas to allow for increased data throughput through spatial multiplexing and increased range by exploiting the spatial diversity, through coding. On January 19, 2007, the IEEE 802.11 Working Group unanimously approved 802.11n to issue a new Draft 2.0 of the proposed standard.

Release Date: October 2008 (est.)
Op. Frequency: 5 GHz and/or 2.4 GHz
Data Rate (Typ): 74 Mbit/s
Data Rate (Max): 248 Mbit/s (2 streams)
Range (Indoor): ~70 meters

http://en.wikipedia.org/wiki/802.11n#802.11n
http://www.apple.com/wireless/80211/