Are they porting compiler and build system or the entire IDE?
If they are porting IDE than with what? Isn't VS IDE done with WPF these days? Perhaps they target...ehem...WINE?
Or are they rebuilding it around Visual Studio Code?
As usual, the Slashdot article title is misleading. What they are describing is not really the porting of Visual Studio to Linux, although MS has been hinting at that for awhile. What the article is describing is the integration of the IDE (running on Windows) with a Linux tool chain (running on Linux). Which per my earlier post, has been possible before with third-party Visual Studio add-ons. For some use cases it is a win.
If you are not already a Visual Studio user and are developing exclusively for Linux, then you are not the target audience.