Tech Testers (guys playing already right now) are immediately in the beta. Like me. Planetside 1 veterans and current Planetside 1 subscribers get in almost immediately. Mixed in with them will be those who have acquired Beta keys will get in periodically next. Lastly, those who have simply applied will get in later.
This is no "demo" beta the likes of which most modern "betas" go. The PS2 beta may likely go on for several weeks using builds far from the complete thing, with the huge amount of would-be beta testers being invited gradually over that period.
it started yesterday. active ps1 subscribers are already in.
They use twitter to relay a lot of development info. I don't use it myself, but i watch the planetside universe forums and everything quickly surfaces on there. Great source of info if you're following the game.