Vbulletin have started to send out private alpha tester invites.
vbseo was accepted. If you have not had your invite yet, then I suggest you contact vbulletin and put in some word so you can become private alpha/beta testers as vbulletin plan to have a wide range of 3rd party developers to be apart of the alpha/beta test. If you are seriously keen on impressing your customers then I am sure you will put forward to vbulletin a request to be apart of it.