It seems that sending out marketing materials ahead of your actual release date will only lead to leaks. This morning, two images showing promotional posters for Destiny 2 leaked onto the internet. One appeared on Imgur and clearly came from a GameStop employee, while the other appeared on Italian site Lega Network. Both posters show a September 8, 2017 release date.
Zooming in on one of the images also points to Destiny 2 having a PlayStation 4 exclusive Beta, much like the original release.
In February, Activision confirmed that Destiny 2 was still launching this year. That was always the original plan, with Bungie's contract stating that full Destiny releases would come in 2013, 2015, 2017, and 2019, but the first Destiny didn't launch until September 2014 and further delays cast doubt on hitting that marker.
Activision and Bungie have also confirmed that existing Destiny characters will be making the transition over to Destiny 2, but their gear and levels won't be coming along.
"We know that, just like us, you have grown fond of the Guardians you've created, so we do plan to preserve your character personalization," said Bungie at the time. "We believe this is the best path forward. It allows us to introduce the major advancements and improvements that all of us expect from a sequel, ensuring it will be the best game we can create, unencumbered by the past."