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Judging from the earliest Github issues, it's been there since late 2018.

edit: As pointed out below, it looks like the title refers to recent source code commits, not the creation of the repo.

Relevant links:

The first part was System.Xaml; the next one was the build infrastructure, I think. IIRC they said that by .NET Core 3 Preview 7 they want to have WPF completely on GitHub. Until then they're probably cleaning up the code as best they can before making it open-source.

Edit: The roadmap https://github.com/dotnet/wpf/blob/master/roadmap.md has a list what's currently available and what's still missing. Looks like by now the main parts (PresentationCore, PresentationFramework) are open-sourced as well.

looking at the guts of the source code, looks like it's only just been committed ~13 hours ago. Various other things have been around for a while

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