Today is the release of the latest developer tools for Windows Phone 7. And with this release, another step have climb, because the tools are now in Beta. When you look at the release note you will see that there is a lot of braking change. They work a lot in refactoring stuff like merging multiple DLL in a single assembly. The application bar now required a value on the new “Text” property.
It seems that we will now be able to use Expression Blend 4 RTM. In fact, with the tools now provide a new version of Expression Blend 4 that will run side by side with the RTM version. This version is specific to the Phone, so you will not allowed to create other project.
So i suggest that you read the following post about those changes:
You can download the latest version of the Developer tools here: http://www.microsoft.com/.../details.aspx?FamilyID=c8496c2a-54d9-4b11-9491-a1bfaf32f2e3
Official blog post from the team:
And a great blog post from the Expression Blend team on the new feature: