So what does it (they) do? According to Glass evangelists , its power is limited only by software developers' vision. In this initial release, Glass will primarily be a means of interfacing with the internet and all its glory in a more intuitive, hands-free way. But whether it will be a hit with the general public is an open question, especially when it's already been the subject of ridicule on Saturday Night Live and received scathing pre-release reviews like this and this.
New high tech gadgets, especially one involving wearable fashion statements like eyewear, will have to be doubly desirable in terms of functionality to overcome the glaring "dork factor". If the Segway couldn't catch on, despite all it's pre-release buzz and luminaries including Amazon founder Jeff Bezos to gush that "cities will be built around this device", it's not too surprising that the public is a bit more skeptical of pre-release hype nowadays.
Google plans to release the first version of Google Glass to consumers in early 2014 at a cost of just under $1,500. Lines are forming now.