2018.2 brought in sln project files for IL2CPP for Windows Desktop, been waiting this since first public 2018.1 beta so happy to see it finally being out here, thank you.
I did notice however that it picks up the project folder name for the build name and _Data -folders prefix instead or the target folders name - like it would do if you build it through Unity without creating the solution file. I think custom built GameAssembly.dll file is interchangeable with the editor built one regardless, but if you build whole thing you’ll end up with wrong directory names unless your project folder and build target folder are named the same.
PS. I’d still love to have option to just name the build name myself in player settings, instead of picking Project Name or folder name for it.