On August 14th the second version of the cross-platform, open source framework was released. At the same time, ASP.NET Core 2.0 and Entity Framework Core 2.0 was also released.
.NET Core 2.0 includes major updates that make .NET Core easier to use and much more capable as a platform. The following improvements are the biggest one.

Runtime

• Major performance improvements in the runtime and framework
• Implements .NET Standard 2.0
• 6 new platforms supported, including Debian Stretch, SUSE Linux Enterprise Server 12 SP2, and macOS High Sierra.
• RyuJIT is the x86 JIT in .NET Core 2.0
• Linux and Windows ARM32 builds now available, in preview.

SDK

• dotnet restore is now an implicit command.
• .NET Core and .NET Standard projects can reference .NET Framework NuGet packages and projects.
• The .NET Core SDK can be built from source with the source-build repo.

Visual Studio

• Live Unit Testing supports .NET Core
• Code navigation improvements
• C# Azure Functions support in the box
• CI/CD support for containers

To read more go to .NET Blog post

Also see the Launch video