Microsoft: Today, we are happy to announce an early access build of .NET Framework 4.7.1. The .NET Framework 4.7.1 is the next version of the .NET Framework. It is currently feature-complete and in the testing phase. We are asking for individuals and companies to help validate the quality and compatibility of the release. It is not ready for production and is not supported. The current build of the .NET Framework 4.7.1 being shared is build 2538.
Release Notes: These release notes are current for .NET Framework 4.7.1 build 2538, released 2017-08-07.
Download: NET Framework 4.7.1