B/X Known World
I'm pretty sure someone did (or is doing) a conversion of the Creature Catalogue to 5E over on RPG.net.It was supposed to be in the same post. Since they asked me all about my income and spending habits, my gaming history, and my favorite campaign settings, I'm hoping they will read between the lines. "Hmm, this guy loves Mystara, and he spends hundreds of dollars a month on 5E stuff. Maybe we should connect the dots..."
Honestly though, I don't know if I want Wizards of the Coast to do a full release of the entire Mystara setting. As much as I love it, some of it really hasn't aged well and other parts of it would never get a green light from a cultural sensitivity expert. (And some of it needs to be completely rewritten IMO, but anyway.) If they released something small, like an updated 5E Creature Catalogue with all of the monsters from the old BECMI modules converted to 5E, or maybe an updated version of "Keep on the Borderlands" or "Rahasia," I would be all over it.
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These, but updated for 5E? Yes please!