Bluetooth now has an official specification for version 4.0, currently scheduled for release at the end of the year. Of course Bluetooth 3.0 was released in April 2009 and it hasn't really caught on yet, especially when you consider most mobile devices -- including the iPhone, iPad, and iPod touch, still use Bluetooth 2.1 EDR.

This new 4.0 spec does promise reduced power consumption so maybe Apple (and others) decided to skip the previous generation and upgrade straight to this one? We'll find out next year...