In a recent post, Microsoft is rumored to be working on the next big update to the next full version of Visual Studio, dubbed "Visual Studio 15.", which will reportedly (and unsurprisingly) be called Visual Studio 2016. According to WalkingCat on Twitter, this might be a "lightweight installation experience of Visual Studio 2016."
According to Mary Jo Foley's Microsoft sources, they're special features in Visual Studio 15 that will likely show up in Visual Studio 2016:
"There's also a feature called "AnyCode" in the new VS release. AnyCode allows developers to use Visual Studio with source code that hasn't been organized into projects and solutions. The private preview of VS'15 also includes TypeScript 1.8, and NuGet 3.4. NuGet 3.4 adds support for running NuGet in Linux and Apple environments, among other features. The preview also adds support for SQL Server 2016 and the most recent Azure SQL Database features in SQL Data Tools and Server Explorer."
Microsoft made Visual Studio 2015 available in July 2015, and its received a several updates. The last Visual Studio 2015 update was in first week of March.