This wasn't demonstrated, but it appears that you can use Diamondback to compile vb.net applications as well. It doesn't have a personality for for vb.net so you cannot create vb.net applications, but you should be able to edit and compile an existing application. I don't know if it is going to support visual form design, but I doubt it will.
I am curious what would be involved to create and install your own personallity into the IDE. . .