Zip, other than BT 2.0 - a blessing for us frustrated Treo users.
I must assume it's not ready for market, otherwise the Apple Store would be taking orders, even future ones. It's so sleek, it may do OK even from non iPhone users. In fact, some might want it just to look like they have an iPhone (witness the abundance of white, apple-like earbuds out there).
I was unable to find a link for the headset for the iPhone, but in the keynote speech, there was some stuff on it. Go to http://www.apple.com/quicktime/qtv/mwsf07/
then click 'watch keynote'. at about 1:28 theres a short thing on the headset
Either that or a pullaway like those yo-yo's. You pull the other one to the other ear from the main device. The line would go behind your head (under long hair) And when you take it off the line would go in the main set like a cord on a vacuum cleaner.