Director Uwe Boll contacted Blizzard about directing the film, but Blizzard refused. As quoted by MTV news Uwe Boll stated: "I got in contact with Paul Sams of Blizzard, and he said, 'We will not sell the movie rights, not to you... especially not to you. Because it's such a big online game success, maybe a bad movie would destroy that ongoing income, what the company has with it."
Duncan Jones said that the original script was very one sided in terms of the two factions (horde and alliance), after signing on to direct he made major edits to the story as well as the script so both factions could tell their side of the story.
Bill Westenhofer, the lead visual effects supervisor for the film, is a long time World of Warcraft player and has mentioned getting up at 2 AM to raid with his guild while on film sets. Robert Kazinsky is also a die hard Warcraft player and recalls producers telling him to turn the game off while on the set of Pacific Rim (2013).
The source for the movie adaptation is being taken from the books "Rise of the Horde", which tells how the Orcish Horde was formed; as well as "The Last Guardian", which shows the human side and reaction to Orcish invasion.
The film went through 20 months of post production. Thomas Tull the CEO of Legendary Pictures and producer of the film said that the things Duncan Jones and the special effects team are doing are truly on the cutting edge.
When a fan asked Duncan Jones where he would be shooting the film during a Blizz-Con Q&A he was not allowed to answer but did hint at the shirt he was wearing that said "Vancouver"(where the film was shot)
Duncan Jones said that the Warcraft universe is very "High Fantasy" or in other words very eccentric and planned to make it feel more grounded in reality though at the same time keep the look and feel of the games in the film.
Lifesize weapons and suits of armour were built for the orcs despite the orcs being played by actors via motion capture. This was mainly for photographic references and so that they could use them as props on the set.
At the 2014 Comic-Con, Legendary had brought some weapons from the film to show off as well as a teaser. Fans of the series instantly recognised one of the weapons on display that is commonly known as the Doomhammer (one of the most iconic weapons in the game).
A live action concept trailer for the film was shown at comic-con a few years ago showing a knight begin a fight with an Orc. It was revealed hours later that the film had not even started pre production.