It’s been a while since Chris Metzen was associated with Blizzard, but he remains very active on social media. If you don’t know his work, know that he was the creative director on several Blizzard titles, starting with Warcraft III: Reign of Chaos, of which he contributed greatly to the screenplay and script.
In other words, he knows Arthas well and has already expressed his wish to see his story adapted on the big screen. He also recently declared on Twitter that he would like to see Henry Cavill as the Lich King.
Henry Cavill, well known to the general public for his roles as Superman and Geralt of The Witcher is also a huge fan of the Warcraft universe. So it could happen one day or another, with many rumors already talking about a Warcraft movie.