As it stands, I have spent quite some time painfully extracting X++ and Binary hotfixes description one at a time from LCS preparing release notes for my clients. This is because there is no feature in LCS (yet) which can allow export of this information.
If you are in the same boat, and you need to prepare release notes urgently, here is a tool by Tomek Melissa that you must try. Please note that its not a Microsoft supported release so you need to try it at your own risk.
PS: I have tried it and it works like a charm! Its not limited to just what I mentioned in this post.