Monster Hunter Wilds's first expansion, Ascendance, is set for release sometime next year. But, judging by some very suspect recent changes to the Wilds beta app on Steam, we may be playing some of the new stuff earlier than we thought.
On Steam, Capcom quietly updated the Monster Hunter Wilds Beta app to now say Monster Hunter Wilds: Ascendance Beta test. You can see the change log on SteamDB (via PC Gamer), which also shows an updated key art - all signs that point towards an impending beta for Ascendance.
