14/02/2023
While the GitHub repo shows the nitty-gritty, granular details the dev team is working on, a more high-level view is provided on Microsoft's Themes of .NET site, which includes kind of a roadmap for .NET 8. There, you can see that "Native AOT in .NET 8" is 17 percent done, while "Host work in .NET 8" is 20 percent done.
Much more on Blazor is provided in the ASP.NET Core Roadmap for .NET 8, which shows 23 open issues, ranging from "Real multithreading (on supported browsers)" to "Ability to run multiple Blazor server / Web assembly apps in the same document."
The latter is interesting because it's associated with other similar issues:
Mixing Blazor WebAssembly and Blazor Server Pages in same application #37131
Blazor: Combine server and client to get the best of two worlds #35358
Consider a React Server Components-like Blazor hybrid #29577
And from all that came a hot new project from Steve Sanderson called Blazor United, which was unveiled in a January YouTube video as a prototype project that was soon moved to the GitHub process. (See the Visual Studio Magazine articles "Steve Sanderson Wows Web-Devs with Peek at 'Blazor United' for .NET 8."and "ASP.NET Core Dev Team Launches 'Blazor United' Push for .NET 8.")