I don't think they are sending out invites, I think that anyone who wants to do it is allowed.

As for me - I don't own a PS4 because I literally play no video games besides FF14 at all. Sometimes the RNG and the doom and gloomers get me down about this game and I think about playing a different game, but then I think about going back to playing on PC and that bums me out. The #1 thing I love about FFXIV is that you can play on counsels. Its amazing. PS3 is pretty gimped, but I probably won't waste time on PS4 Beta until I can spend my time working on my real chars. I just barely have enough time to squeeze into FF14 to call it a full blown addiction as it is!