Fileplanet's link, while enticing, will not get you instant access into the closed beta. What it will do, however, is sign you up for an account that will let you be eligible to be selected for the closed beta. It will not let you play the game immediately, but it will certainly net you a chance at playing sooner rather than later.
According to Sparkplay Media, Fileplanet will be involved with getting the game and the word out there, but it seems they've jumped the gun in releasing their link for the game. It's cool, we all make mistakes.
As to what special in-game items Fileplanet members will be receiving for signing up and playing, well, that's still a secret to everybody.