Interesting changes. Full source code access was probably the most requested thing on the forums for years, and now they get it. Looking forward to articles which analyze the source code (if the EULA allows that). The addition of C# is also nice. Probably easier for indies and they have a alternative if they don't want to use the visual Flow Graph.
Now that they added DX12 I hope they add Vulkan in the near future as well.
btw: the full release notes are in the docs: http://docs.cryengine.com/display/SDKDOC1/CRYENGINE+V
