Paul Vick gave a good PDC talk this morning on VB language futures.
VB and C# are focused on enabling Language Integrated Query (LINQ) across objects, relational, and XML data, so there is significant overlap in the feature sets. Due to the differences in the languages -- customers, design philosophy, exist feature set, etc. -- there still are interesting language differences. For example, VB's existing support for late binding impacts type inference, which is one of the key features for adding query support to languages.
The VB team has posted a bunch of information, both at the VB futures area of the VB Dev Center and as part of the LINQ site. The Overview of Visual Basic 9.0 looks like a good place to start. Enjoy!