I downloaded the last WCSF drop and I started to play again with the Guidance Package.
The first thing you are going to notice after register the guidance package is that the registration is not replacing Web Client Software Factory June 2007 version. This happens because the new guidance package has a different Guid and is going to work side-by-side with June 2007 version.
Figure 1. The new September 2007 Guidance Package
Let’s see what’s new in the guidance package regarding ASP.NET AJAX support.
Note: You need to download and install ASP.NET AJAX Extensions in order to use this new features.
As soon as you create a new Web Client Software Factory September 2007 solution you will see a new option on the wizard.
Figure 2. The Enable ASP.NET AJAX Support new option on the Create Solution wizard page.
Note: If you don’t have ASP.NET AJAX Extensions installed this option will be disabled.
As you imagine, this option enable your new solution to support ASP.NET AJAX by adding the required configuration statements to the web.config. Also add a reference to ASP.NET AJAX Extension assembly.

Figure 3. Some of the statements that are being added to the web.config.
Figure 4. The website a has reference to System.Web.Extensions assembly.
Another little gem is the possibility to enable an existing (WCSF or not) non-AJAX solution. To do this you just have to run the new recipe Enable Ajax.
Figure 5. The new Enable Ajax recipe.
This will enable your solution in the same way I have explained before.
I hope you find this useful. Enjoy this enhancements and provide us feedback.
To get a deepest knowledge about WCSF vNext and what the team has been doing, please check the following posts: