Visual Studio is joining Visual Studio Code in offering support for the Language Server Protocol. As an extension author, you can now write Visual Studio extensions that leverage existing language servers to provide a rich editing experience for languages that initially had no native language support in Visual Studio.
Consumers of Visual Studio IDE extensions visit Visual Studio Marketplace to discover and acquire extensions. But extension publishers visit Visual Studio Gallery to publish and manage their Visual Studio IDE extensions. Henceforth, extension publishing and management will also be in Marketplace.