So I actually backed this product, and the guys from Bragi are very good about posting updates. I believe they have a deadline of posting an update on the 1st of each month. They always post their progress and include videos with each update showing new features or completion of the current stage.

It also seems that most of the comments are saying its all vapoware. According to the last update, the developer devices are expected to ship next week and the week after. I will gladly post an update when I receive mine.