This is the first release, even though it is version 3.8.0, done by the Haskell IDE team. It features an incredible list of new and exciting features such as, but not limited to:
It provides solely syntax highlighting in vscode and is complementory to vscode-haskell/Haskell.
Why the change?
The old extension justusAdam/language-haskell was removed from the VSCode marketplace (note, not the same as openvsx which is the VSCodium marketplace), and the publisher justusAdam was deleted (for somewhat unclear reasons), making it tricky to re-upload the extension.
Thus, justus decided to donate language-haskell to the community so we can make releases and maintenance work.
This donated project is GitHub - haskell/language-haskell: Syntax highlighting support for Haskell in Visual Studio Code · GitHub now.
It might make sense to provide them in the same repository, not as the same extension, imo, as one deals with the language server and the other with the syntax highlighting. Reasonably, users should be able to change which one to use, so separate extensions makes sense to me (until I am convinced otherwise).
My personal recommendation for the Haskell setup on VSCode is: