As of Jan 8th applying for Final Fantasy XIV beta is now open!
To apply to become a beta tester, you need only provide a valid email address, your date of birth, and your country of residence, as well as indicate the beta test(s) in which you wish to participate. A Square Enix account is required to participate in the beta test. However, an account is not required when submitting a beta tester application. The beta will come to the ps3 in phase 3 so if your hoping to play it on ps3 you will have to wait till then.
This is a 4 phase beta test and the 1st phase begins mid feburary.
For more details check out the beta test roadmap.
[ SOURCE: finalfantasyxiv.com ]