Since there's no PC thread for this yet but confirmed coming out for PC. Here's an interesting bit of news about a partnership with Blizzard for Battle.net integration
http://us.blizzard.com/en-us/news/?d=2017-5#181745
http://us.blizzard.com/en-us/news/?d=2017-5#181745
We want to let everyone know that a new game will be appearing alongside your favorite Blizzard games—one that’s a little different from what you might normally expect. Bungie’s upcoming first-person action game Destiny 2 will be joining the party! We’re excited to announce that we're partnering with Bungie and Activision to support the PC version of Destiny 2 exclusively via Battle.net.
Destiny 2 will be integrated into many of Blizzard’s existing social features—you’ll be able to chat with friends playing Destiny 2 the same way you already can for Blizzard games. Players will also be able to add friends and form parties the same way Blizzard gamers can. And, you’ll see a Destiny 2 status icon by your friends who are playing Destiny 2 the same way you do for friends playing StarCraft II, Diablo III, WoW, Heroes of the Storm, Hearthstone, and Overwatch.