Compare that with, say, Amazon’s Lord of the Rings show, which is set in the Second Age, way before the War of the Ring - the characters in the anime movie may be unfamiliar to most viewers, but the world will likely be pretty similar to what we’ve already seen.
While the names behind the film are interesting, it doesn’t seem like Warner Brothers or New Line are going deep into the Tolkien well for story ideas - the events Rohirrim will be depicting are only a few hundred years before the battle depicted in The Two Towers. The movie is being written by the creators of The Dark Crystal: Age of Resistance, and while Peter Jackson isn’t directly involved, one of the writers for the original trilogy (and the Hobbit movies) is acting as a consultant. Kenji Kamiyama will be directing the movie, and it’ll be interesting to see how well his style maps to a medieval fantasy setting - he’s mostly tackled futuristic sci-fi projects before, including Ghost in the Shell: Stand Alone Complex, 009 Re: Cyborg, and Netflix’s Ultraman.