Just a couple days ago we released the March CTP of Visual Studio Orcas. This represents a large percentage of the new features in Orcas and as such I'd recommend checking it out. We've released a VPC image of the bits (both for Visual Studio and Team Foundation) so that you can avoid the issues around installation of pre-beta software.
Here are the links to download the bits:
If you want to learn more about the new features, I'd suggest reading these two blog entries:
What do you think? Please let us know!