Mono (aka Xamarin) are getting out of the compiler/language reverse engineering game and focusing 100% on mobile. They no longer need to clean room the MSFT implementation because the MSR license as a purple-pill. Now that Microsoft has relicensed under MIT developers are arriving in droves.
Advantages? .NET everywhere, SINGLE reference implementation/specification means no more bugs.
edit: You can see the transformation of Xamarin -> Mobile and replacing internal components from CoreCLR over at https://trello.com/b/vRPTMfdz/net-framework-integration-into...
What does this mean? Googling it led to interpretations that I doubt apply here... ><
http://www.neowin.net/news/microsofts-net-poison-pill
This news, however, is a very positive step. Can't wait for Build next week...
Instead of taking something like Mono that was pre-built to run on their system, they took the CoreClr source that did not have a working build for FreeBsd, and got it to the point that it did.