Here’s a summary of what’s new in this preview release:
Blazor United - Solving Blazor's biggest challenges?
ASP.NET Community Standup - Blazor United in .NET 8
The Blazor team shares early thoughts on Blazor United in .NET 8, an effort to create a single unified model for all your web UI scenarios that combines the best of Razor Pages, Blazor Server, and Blazor WebAssembly.
ASP.NET Core Dev Team Launches 'Blazor United' Push for .NET 8
ASP.NET Core Roadmap for .NET 8
Blazor United prototype
A quick look at some of the experiments we're considering for Blazor in .NET 8
interface I {
string M1() => "I.M1";
string M2() => "I.M2";
}
abstract class A : I {}
class C : A {
public string M1() => "C.M1";
public virtual string M2() => "C.M2";
}
class Program {
static void Main() {
I obj = new C();
System.Console.WriteLine(obj.M1());
System.Console.WriteLine(obj.M2());
}
} 
Here is a partial list of the C# coding standards my team uses and advocates. Most of these are industry-wide conventions and thus using them will ensure that your code is easily readable by people who are not you.
What's the big deal with IAsyncEnumerable<T> in .NET Core 3.0?
[HttpGet]
public IAsyncEnumerable<Product> Get()
=> productsRepository.GetAllProducts(); 