http://www.pcgamer.com/the-destiny-2-pc-beta-is-live/

The Destiny 2 early access PC beta got off to a bit of a rough start yesterday, but it sounds like Bungie managed to get it smoothed out quickly—and more relevant to our immediate interests, it's now open to everyone.   

Those of you who have been playing in the early access beta will need to update, which may require a Battle.net restart. For everyone else, just fire up the client, select "Destiny 2" from the games list, and hit the "Install" button.