Aye I love all of the watch books as well, in the process of reading his new one 'I shall wear midnight' at the moment (it's the latest installment in the Tiffany Aching series); but yes, to answer your question Terry will be there, I got to meet him last time and the guy who runs the cunning artificers website - really nice guy called Bernard (
here are my pics from last years in AZ). It was a blast and we still keep in touch with a lot of the people we met there. - Here's the website for registration if your interested -
Nadwcon 2011