Today Microsoft released the second preview of the next update: Visual Studio 2017 version 15.7:

Visual Studio 2017 Version 15.7 Preview 2

by Christine Ruana

C++ Standards Conformance Highlights (detailed C++ release notes here):

Implemented Template argument deduction for class templates:

​pair p{2, 2.5};

Full implementation of Expression SFINAE

Expand the using declaration to support pack expansion semantics for variadic base class members

Implemented parallel algorithms conforming to the ISO C++17 standard