"FYI: We will be posting a few, rare Beta keys right here during Closed Beta. (First-come, first-served principle; we will also post at different time intervals so everyone has a chance at getting one.) Like us and you will be informed ahead of time. You might want to tell your friends."
"Looking to get into the exclusive Battlefield Play4Free Closed Beta? All you've got to do is create a Battlefield video showing us what you love about the Battlefield series, and why you feel you should be amongst the limited few who get to test Battlefield Play4Free during the Closed Beta!"
I don't think anyone here will get that beta code anytime soon.