Code Coloration for Unity messages: Unity messages (or event functions) now stand out from other methods in the editor. By default, they’ll be colored like keywords, but you can change them to your liking. In this screenshot they’re configured to be colored in bright orange.
IntelliSense: VSTU 3 Preview plugs into Visual Studio’s C# IntelliSense engine to provide code completion for Unity messages. Just start declaring a method, and if you’re in a class that supports Unity messages, our IntelliSense will kick-in and show you the list of Unity messages your script can implement.
Improved Expression Evaluator: The expression evaluator is responsible for displaying the values of the Locals and the results of the expressions you input into the Watch and Immediate Window. We’ve improved our expression evaluator to behave closer to the .NET debugger that C# developers know and love.
According to Microsoft’s Visual Studio blog, developers will need to be running Unity 5.4 to run Visual Studio 2017 RC as their script editor and the setup process will have to be manual due to the fact that Unity won’t automatically recognize VS 2017 RC’s installation.
For more on VSTU 3 Preview and 2017 RC installations, we encourage readers to visit the Microsoft Visual Studio blog as soon as possible.