Well, it looks like Microsoft is making good on its promise. The sources of ChakraCore have now been made available under the MIT License at the ChakraCore GitHub repository. Not only are sources free to developers, but the Microsoft Edge development team also claim that going forward they will continue to develop the critical components of Chakra out in the open.
As for the details, the Edge development team states:
The Edge development team will also be publishing a roadmap for the ChakraCore that will be hosted on their GitHub repository for those interested in upcoming features. The devs plan to keep the roadmap current with details and status updates as the development cycles progress.
For those interested in helping the Edge development team, they are kindly taking feedback via Twitter at @ChakraCore and the ChakaraCore GitHub repo. The devs are encouraging fans and enthusiast to leave notes by opening issues in the repository.
On the surface, hosting the ChakaraCore on GitHub is, perhaps, something Microsoft should have done a long time ago. However, the mere fact that the discussion was being held indicates that the company is arguably getting serious about its relationships with the open sources community.
Better late than never, we say.