The Shin Megame Tensei: Imagine (aka Megaten) Closed Beta Signup is open. You have 25 days before they close, and the beta should start Dec 1st. All that’s required is the easy process of creating an account with Aeria, which you’d need anyways to play the game. Also remember this will be Beta so they warn that bugs and frequent downtime should be expected, they would also like people to report on the bugs they may find.
“English-speaking fans of the Atlus Co., Ltd owned Shin Megami Tensei series (Persona, Digital Devil Saga, among others) are encouraged to register in order to preview the game before it is made available to all members of the public.”
With an invitation like that you’d be crazy to not at least try to get into the beta. Unless you already have WoW and still love it, and what with that Lich King expansion being out by then you’d be far to busy to play some free2play JMMORPG. But for everyone else, go try your luck(my luck is HORRIBLE so I probably won’t get in the beta anyways).