RE:RE:NXOIt's a valid question, if you do a little more reading than their last press release you would read about how they originally planned to have the prototype ready in Q2 of 2016.
They released a video rendering of the prototype and said that they were nearing it's completion which is great and it is excisting, but until its presented and demonstrated to be working as intended, this is a long way from being de-risked IMO.