This short blog just shows you the link to C# 7new features created by Mads https://blogs.msdn.microsoft.com/dotnet/2016/08/24/whats-new-in-csharp-7-0/
It is good to have a PDF or Word file instead of blog post. I have extracted the features without all the comments to PDF. Without the comments is 15 pages, with the comments is 106 pages. You can download the pdf (unofficial) here: https://1drv.ms/b/s!AuZYHSwsevw1b4q5ZfE02eBvc2M.
Hope Mads will have an official C# 7 Specification soon.