That isn't exactly "evidence" IMO. DL does a good job, and pocketnow also, but I am looking for a screenshot of emails or some document pointing towards the 15th. Otherwise its all hearsay at this point.
FWIW I also heard the manager at my store say the 15th, but not sure where they got that info. Maybe VZW is just calling all the store managers instead of making an official email.