It's more than a year, when .NET Standard 2.0 was announced by Microsoft. Now, time is to get an update to it with new features. Microsoft announces the next version of .NET Standard 2.1, which will include around 3K new APIs.
Apart from this announcement, Microsoft also announced that, anyone can now submit proposals for API additions and a review team will review those time to time.
The new .NET Standard 2.1 will include Span<T>, Reflection emit, SIMD, ValueTask, ValueTask<T>, DbProviderFactories and more. If you would like to know what's the API difference between .NET Standard 2.1 and .NET Standard 2.0, checkout this post.
Checkout the official blog post to know more about the key features, the new Governance Model that includes a review board to proceed with formal approval process to include new APIs to the .NET Standard.