The beta FAQ begins by outlining the differences between early game access, beta weekends, guild testing, and the normal beta testing. Early game access, of course, is access to the launch version of the game prior to the official launch date; this privilege is given to those who pre-order the game. Beta testing weekends are exactly what they sound like, and Reid notes that the team is aiming for one more test weekend this month, which will host more players than the last test. Game and guild testing are both the normal, ongoing beta test, with the latter differentiated only by the invitation process for guilds rather than individuals.
The post goes on to remind players that, even with the advent of the beta testing weekends, the NDA is still in effect, and that a player's participation in one beta test weekend does not guarantee her selection for subsequent weekends.
And lastly, we'd be remiss to omit this small detail for our European players: Game testing for European players is "imminent," says the post, and these tests will include localized French and German versions of the game. Beta weekends for European players will begin around the same time.
Now then, the beta weekend FAQ. The post declares the intent of the first beta weekend to have been a "small-scale simulation of a launch scenario." The post also discusses the successes and failures of the test and notes that almost every goal set by the team was met or exceeded. However, there were a few hitches with the invite process, which the team has since fixed.
For the full details, hop on your speeder bike and head on over to the official forum posts.