Mad, there were quite a few people left without a ticket that wanted one, they closed the waiting list because they could not fulfill the ticket demands.
edited to add: the total memberships sold was 950.
8th 2012 24–27 August Birmingham, UK The Eighnnnnnnn Discworld Convention Sir Terry Pratchett Colin Smythe, Ian Stewart, Jack Cohen, Rob Wilkins, Lionel Fanthorpe, Stephen Baxter, Bernard Pearson, Jaqueline Simpson, Stephen Briggs, Ian Mitchell 950
editing the edit: they have sold more in two days the 2012 sold in a month, some more stats below.
http://2012.dwcon.org/blog/2012/03/19/playing-numbers