Maybe it's just taking a long time with R&D? Sadly, it IS pneumatic, and that variety of machine seems to be going the way of the dinosaur. It would really be a shame to have put all that work into developing it, only to scrap the idea because nobody really uses air much anymore. It IS a really cool concept.
Also, there's an entry in their blog from July 31st 2011 saying that their computer didn't properly store emails for the waiting list. So if you never got a message from them, they could have lost your email. It says to sign up again if you are interested.
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