The RP-WF5500 wireless 5.1ch headphones were unveiled by Panansonic, and could hit the market on November 20th in Japan

They are the World’s smallest and lightest wireless surround sound headphones according to Panasonic with a weight of only 255g. It features 5.1 channel with wireless transmission on the 2.4GHz band over a 30 meters range. The 40mm drivers (20Hz - 22kHz) comes from his brother "RP-WF6000" on sale since November 2006.
The decoder supports Dolby Digital, Dolby Pro Logic II, DTS and AAC via a couple of inputs such two optical digital inputs, two analog 2ch inputs (RCA), and one digital audio output.

Furthermore, the RP-WF5500 has an autonomy of up to 6 hours of continuous playback, a bass-boost function and it will be available in black or white color.