We just posted the most recent drop of the Web Client Guidance on Codeplex. At this point we are making fewer changes to the code and focusing more on the documentation. Below is the change log for the drop.
The next drop we will refine our guidance and scenarios on when to use modularity and UI composition. When we have something to share, I will create a blog post as this is an important part of the guidance. We want to ensure it resonates with you.