The W3C has just published the first complete draft of the WSDL 2.0 Primer, together with an updated specification for Part 1: Core Language and Part 2: Adjuncts. It also includes a First Public Working Draft of the SOAP 1.1 Binding.
It's still a working draft, a few of the advanced topics may be changed pending on open issues, but the basic sections are in a pretty good shape and should provide you a good idea about WSDL2.0.
Check it out and give it a glance. If you have any comments, see any glory errors, or just want to say that you like it, let me know.