It means improvements to its existing dynamic capabilities and integration with the other dynamic languages (like VB and C# share on the CLR). So VB will handle both CLR and DLR capabilities. If you look at Craig's blog, he also comments on the REPL capability that Paul Vick blogged about - otherwise known as a command window.

yag

>I see that VB will be based in the DLR (Dynamic CLR). What implication does this have, exactly?
>
>http://blogs.msdn.com/hugunin/archive/2007/04/30/a-dynamic-language-runtime-dlr.aspx
>
>

>We're initially building four languages on top of the DLR - Python, JavaScript (EcmaScript 3.0), Visual Basic and Ruby.
>We shipped today both Python and JavaScript as part of the Silverlight 1.1alpha1 release today. John Lam and I will be
>demoing all four languages, including VB and Ruby, working together during our talk tomorrow at 11:45.
>

>
>TIA,
>
>Alex