Here is what is new for the NXT:
A complete redesign of the LEGO® MINDSTORMS® NXT Services that greatly facilitates use in Microsoft Visual Programming Language. The new services provide full access to LEGO MINDSTORMS NXT ranging from a new brick service to services representing all of the standard motors and sensors. In addition, services are now also provided for a set of new sensors from HiTechnic and MindSensors. The redesigned LEGO MINDSTORMS NXT services do not interfere with the LEGO MINDSTORMS NXT services provided as part of Microsoft Robotics Studio (1.5) and can be used completely side-by-side. Check out the new tutorials and samples!
You can read the full post here: Samples Update for Microsoft Robotics Studio (1.5)
I haven't used the Robotics Studio recently. But I do use Visual Basic.net (and C#) quite frequently, so I think I'll be checking this out next week...