The dates have been finalized for the Destiny 2 beta on the PC. Those who pre-ordered the game will get to play it starting on August 28. It then turns into an open beta on August 29. The beta is slated to end for everyone on August 31. Will they extend the beta to last roughly a week as they did for console players? Maybe. Given how the PC release is already dreadfully behind the console release, I wouldn't get my hopes up too high for much of anything.

Bungie also made note of the minimum and recommended specs that you should have for the game.
Recommended Spec
Intel - Core i5-2400
AMD - Ryzen R5 1600X

Nvidia - GeForce GTX 970
AMD - Radeon R9 390


Minimum Spec
Intel - Core i3-3250
AMD - FX-4350

Nvidia - GeForce GTX 660 2GB
AMD - Radeon HD 7850 2GB


CPU - Intel Core i5-7400
GPU - Nvidia GeForce GTX 1060 6GB

CPU - Intel Pentium G4560
GPU - Nvidia GeForce GTX 1050 2GB

Keep in mind that "Bungie's Event Machine" ran Destiny 2 at 4K resolution at 60FPS.

Bungie also notes that they will have more details about "how you can get the most out of your first steps in the PC build" in the weeks to come, whatever that means.