A basic WCF Adaptor for ESB.NET 5.1.0.0 has been released (with source) to Codeplex.
Whilst it only show off the basic WCF features such as basic SOAP processing as well as MTOM attachments, it shows how to integrate to ESB.NET.
WCF configuration can be changed to add Security, Reliability etc.
This is an initial release, using .NET 3.0.
The next complete build of ESB.NET will require WCF.