Panasonic announces what they are calling the world's smallest and lightest wireless surround sound headphones.

The Panasonic RP-WF5500 supports 5.1ch Dolby surround sound over 2.4Ghz wireless connection.
The weight of the RP-WF5500 is only 250g. Other features of the RP-WF5500 include 20 to 22,000 Hz frequency band, 30m operation range, 6 hour battery life and are available in black and white.
The Panasonic RP-WF5500 starts shipping on November 20th in Japan.
Via this Panasonic press-release (Japanese).
Sony is going to introduce 7.1ch wireless surround sound headphones dubbed Sony MDR-DS7000.

If you look into wireless headphones, surround sound is becoming more and more of a standard feature. See the bestselling Wireless surround sound headphones here.