Today, the Entity Framework Core team announces the first release candidate (RC1) of EF Core 5.0. This is a feature complete release candidate of EF Core 5.0 and ships with a "go live" license. You are supported using it in production.  

Announcing ASP.NET Core in .NET 6 

Announcing .NET Core 2.1 Preview 2 

Announcing .NET Core 2.1 Preview 1 

Announcing .NET Core 1.1 Preview 1 

Announcing Rust for Windows v0.9 

Missing Features in Entity Framework Core
Here’s a brief summary of some of the features that were present in previous versions of Entity Framework (6.x) and were excluded (or are not yet implemented) in Entity Framework Core 2.0: 

In Entity Framework 4.1+ we would validate entities before sending them to the database. We don’t perform validation in EF Core, but there is a quick way to add at least some of it back.