I wouldn't be in too much of a rush to get into beta. The cap is being set at level 30, which is reachable within 3-4 days of playtime if they open the servers 24/7 like they plan to. Especially since were limited to the immediate areas around Limsa Lominsa, you will get bored well before retail. Right now current alpha testers are the only ones going into beta, but the plan was that once the new servers are stabilized with this population, more invites will be going out. Though at this time it is unlikely there will be an open beta, the vast majority of people who applied for beta should get invites eventually. Hell, alot of alpha testers who got invited were applicants for PS3 beta, and were told to participate in PC beta till then.
We had 10 servers open at the end of alpha with about 5k testers each, and they had indicated they wanted to expand it to 10k or more through the beta. Be patient and keep your eyes on your inbox, we just got notification that the beta client would be available soon, but no word yet on when we start. If they an get the client out this weekend, probably after the 4th.
Once we have permission from SE we will be having some content up on the site from the beta.