Bungie has said that it will start randomly releasing beta codes for Destiny this week.
from the game's official feed tells us: "You might want to keep checking back in with us this week; we'll be posting #Destiny Beta codes randomly each day."
The beta is due to go live early next year across all four of the game's platforms. Aside from Bungie randomly dishing them up on Twitter, the company will release them to players who preorder the game from participating retailers (listed here
Bungie community manager Eric Osborne has said that the developer will treat the Destiny beta like a full product launch