yeah to my knowledge from looking at vbulletin.com is they are on alpha
vB4 and vB4 Suite Update - vBulletin Community Forum
They are doing a pre sales thing to drum up interest. I know alot of people are upset about there pricing structure.
We will as always support new versions of forums released that we integrate with but as posted we are on the beta list of developers to obtain software to work with so once it rolls into beta. I would not expect a final release of vbulletin 4.0 until around christmas or so. Since they are still in the alpha stages and its mid October they need to go into beta release it to developers and testers with a final coming out hopefully late this year or early next year. That of course is subject to change at any time but we should support the final 4.0 when it is available.
If anyone purchases licenses for 4.0 because of the savings it does not necessarily mean your going to get
vb 4.0 right now. I think pre sales means exactly that. Much like the same if you purchase a movie pre sales before it is released. you need to wait till its released.