Developer Bungie announced that the Destiny 2 beta will be extended for further “testing”. So we the playerbase have more time to enjoy it, use the additional time that the developers give us. But it is still not stated when the beta will be available on PC.
The Destiny 2 Open Beta has been extended through Tuesday 7/25 for additional service testing. Expected completion is 6 PM PDT.
— Bungie Help (@BungieHelp) 23. Juli 2017