Andem - 2:40 pm on Oct 5, 2010 (gmt 0)
This is exciting! I didn't even know Kier & Co. were working on a new product. I consider vB4 an inferior product to vB3, even though the former is basically the latter with some gimmicky web 2.0 layout features and a modified template engine.
I'm definitely going to keep an eye on Xenforo from now on :)