Did you get your Dragon Quest X beta test confirmation e-mail? Square Enix was supposed to send out notices to successful candidates today, and this appears to be the real deal:
The e-mail says that the development team is currently working on final preparations for the beta test. Details on start time and content of the test will be announced once finalized.
Those who do not receive notice today may still be able to get into a future round of beta testing. Square Enix says it will continually add new people throughout the course of the beta test.