XAML 2009 support in VS and blend

When can we expect XAML 2009 support in the tools like Expression Blend 4, Visual Studio 2010? Has Microsoft mentioned something 开发者_JAVA百科somewhere publically? Willl we have to wait for Blend 5 and VS 2012?

I don't think Microsoft has mentioned this, from my understanding you can use it in WPF if you use loose Xaml files, but no designer support.