The original issue on GitHub ask for that the toolpanes (terminal, Debug console, etc) can be opened in a floating window. What the upcoming vs code feature has implemented is that the code editor for a file can be opened in a new window.

The announced feature doesn't actually address the original issue raised and is much less useful than the features the OP ask for.

Personally it is rare that I need to display two documents in two seperate windows, but to have some of the tools in seperate windows. That I use all in the time in visual studio proper.