In an interview with Cinema Today, Anderson said, "Recently, I love Monster Hunter! Now, we are in the middle of planning a movie version." There's not much more info than that, and this sounds very early in production. Still, if you like what Anderson has done with the Resident Evil movies, this should make you happy. If you don't then, well, yeah.
「モンハン」実写映画化を企画中！『バイオハザード』シリーズ監督が衝撃告白！ [Cinema Today]