MrDove has told me previously that they would have no problems issuing refunds if this project gets abandoned.  I last spoke with their drone operator yesterday (cool guy) who gave me an update.  I've seen videos of them testing the carry load and a crude dropping mechanism.  They aren't happy with the dropping mechanism in it's current form and that is what is holding back a demo video and another push for donations.  I'll urge them to speed up the process of a public demo video, even if the dropping mechanism sucks, to reassure folks that they are actually putting work into this.  The drone in the videos I saw was a DJI Phantom (not sure what model exactly) if that hasn't already been mentioned.