The Secret World launch date is steadily approaching, and to get ready for that, pre-orders have been announced. Should you choose to put down money for the game before it's release, you'll get a few things in return, the most notable of which is access to every Beta weekend. You will also get early access, up to four days head start before the game releases, an experience-boosting item and unique in-game shirt. You'll also get an in-game pet and early access to character name creation.
I'm not sure about most of those pre-order bonuses, but beta access is pretty nice, so if you are just dying to try it out, go reserve a copy. As for me, I think I'm going to wait on outright buying the game. I may be down with a pre-order though, if it lets me try the beta weekends.