They still haven’t posted anything about 5.6.1 as far as i know, I really hope they will soon, I’m very curious as well 
If you have access to the source code the releases are listed here: Releases · EpicGames/UnrealEngine, in the version there always is a link to the changelist in a forum post on this board Latest unreal-engine topics in Announcements - Epic Developer Community Forums.
Here is how to get access to the source on github if you don’t have it: Unreal Engine on GitHub, if you abolutely can’t wait for the changelist post you could read the commit history on the release branch.
Let’s hope they fixed some of the messes in 5.6 
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