Ловите публикацию про второе превью Entity Framework!
https://blogs.msdn.microsoft.com/dotnet/2017/06/28/announcing-ef-core-2-0-preview-2/
https://blogs.msdn.microsoft.com/dotnet/2017/06/28/announcing-ef-core-2-0-preview-2/
Microsoft
Announcing EF Core 2.0 Preview 2
A first-hand look from the .NET engineering teams