Virtual Threads are actually in their second preview which means it might not be years before we see them standard in the JDK.
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It currently looks like Virtual Threads will be final in JDK 21, to be released in September this year.
Just to be clear that's a submitted draft JEP [1] so not quite there yet....
But it is not the first iteration, and the loom branch has working versions for quite some times now. It’s definitely not in a design-only phase.
Loom was already merged into their master equivalent, iirc. It was shipping behind a preview flag for a while.