Visual Studio 2017 (15.3) Preview 2 was recently released which includes .NET Core 1.0 and 1.1, our latest production releases of .NET Core. You will need to install the .NET Core 2.0 Preview 1 SDK to develop .NET Core 2.0 applications using Visual Studio 2017 (15.3) Preview 2 .
We are working on .NET Core 2.0 Preview 2 which will be available soon. If you would like to experiment with .NET Core Preview 2, you can install the latest daily build of the .NET Core SDK. Choose the appropriate package from the Installers and Binaries table. These daily builds will work with Visual Studio 2017 (15.3) Preview 1 and Preview 2.
Because .NET Core is designed to be side-by-side, previous versions are not uninstalled automatically. If you do install the daily builds, previous daily builds can be uninstalled to keep the Programs Control Panel from being cluttered up with Preview entries. Be careful not to uninstall the 1.0 or 1.1 versions.