Doubtful. These are entirely different parts of the toolchain, and the goals (while similar in wording) are entirely different from each other.
No, if you watch the videos, Anders specifically says that they plan to eat their own dog food on this one and expose APIs to the same compiler they use. He also says that they're rewriting the C# compiler entirely in C# as part of Roslyn.
Exactly, and that has nothing at all to do with the position posted by Microsoft in terms of this thread.