Seeing as the release date is only one day behind the date D1 dropped, id imagine we're looking at mid to late july.
Also someone found a possible...."hint" for the dates in the reveal game play. There's a screenshot where the players glimmer (i think) was shown as 17177 which could be seen as 7-17-17 which is July 17th. The same date that Destiny 1 beta started.
Also to even further support this claim the item next to it was shown as 98 (item similar to legendary marks?) Which could be 9/8 which is the actual release date.
Bungie is notorious for hiding subtle hints in reveals and gameplay videos.
Here's the link to the video. [url=https://youtu.be/Vs1p1Z1_oVM][/url]
English