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It's MIT (and there's also a patent promise).

https://github.com/dotnet/corefx/blob/master/LICENSE

They are using the MIT license.

Source: http://blogs.msdn.com/b/dotnet/archive/2014/11/12/announcing...

> They say open source, but not which license they're going to use.

AFAIK, it will be MIT licence.

Edit: Yep, MIT. It's not like it's secret: https://github.com/dotnet/corefx

It would pretty dumb of them to take this step and then pick a license which wasn't permissive enough to make it happen. Plus, given that they mention they're working with the Mono team on this, I'm sure they're going to get good advice.