Visual Studio 2017 will be released on March 7, 2017 during the Visual Studio 2017 Launch Event.
The announcement came from the VS Team via a blog published, today. From the blog post:
On March 7, we are proud to bring you our newest release, Visual Studio 2017, with a livestreamed two-day launch event at https://launch.visualstudio.com. Brian Harry, Miguel de Icaza, and Scott Hanselman will join me on stage to share the latest innovations from Visual Studio, .NET, Xamarin, Azure, and more. You will have the opportunity to engage in demo packed sessions focusing on key improvements within the product. To help you get started, on March 8, we will also bring you a full-day of live training with multiple topics to choose from. Save the date.