No, it is not for all variables. I hovered over an int[] and I was able to see the values inside, but not for a List<string>. Just to test this issue, I assigned an int named "A" the value of 4. I could not see the value of A by hovering over it.
The way I got to this point is by right clicking on the left margin > Advanced > Debug covering test in existing task runner...
If I use the standard MSTest debugging, I'm able to see all the values of these variables.
This is on Windows 10 Pro, Version 1709, Build 16299.371.
Visual studio:
Professional 2017
Version 15.7.1
NCrunch:
Company Seat License
Version 3.15.0.6