This series of blogs will help you take off with the new Webtrends JS.
As each new post is made, this post will be updated with links.
Either from creating your Analytics 10 web site space or from the Webtrends Tag Builder
Full documentation on the new JS can be found here. Topics include customizing the tag, details on adding plugins, etc.
If anything in my posts contradicts what you see in the documentation (hopefully not) you can probably trust the documentation first