While its impossible to make perfectly accurate predictions , Im confident hat advanced Web services specifications will begin to mature and the number of companies who adopt and encourage the specifications that exist will increase. Issues such as security and platform-independent messaging are too important to let infighting among competitors slow the logical growth of XML-based Web services technologies.
I believe this book will be useful to you throughout the next few releases of WSE. Be sure to keep checking the online versions of the Web services specifications since those can be updated rapidly and repeatedly. All copies of the Web services specifications that have been publicly released and that are supported by Microsoft are available at MSDN Online.
Good luck building and using XML Web services!