By design, Journey requires a different kind of multiplayer beta. A select number of players will have the chance to check out thatgamecompany's latest months ahead of its formal release, the details of which were made available today. There are a couple things to pay attention to.
One, if you were you one of the "very earliest adopters" (read: buyers) of Flower and a member of PlayStation Plus, a code may be headed towards your account in the form of a private message.
Two, thatgamecompany is giving away some codes--but you only have until 7:00 p.m. PST tonight to send an email to journeybeta@thatgamecompany.com, which gets you into the Journey lottery.
Stay tuned to thatgamecompany's Facebook page for additional details, as the beta kicks off.