How does early access work?

What does "Open Beta" mean exactly? Will anyone be able to download the beta software on their PS3? Or do you have to have a PS3 beta code? I have 2 copies of the Collector's Edition on pre-order with GameStop for PS3, will that enable me to play early or do I need some other pre-order codes to do so?

I'm anxious to play the PS3 version, but I only received the PC Beta Code... even though I applied for the PS3 only. (I don't really have a gaming PC to play on, only a laptop i use for web surfing. I don't even know if it will have enough specs to run the game.)

Sorry for all of the annoying questions, this will be my first Beta testing. Thanks for the help.