I thought this was being made by the main MH team. At least that's what I was reading in this thread last night....According the rumor leak that correctly predicted this game and the XX Switch game, the PS4/Xbox game is designed specifically for the Western market, with changes to the gameplay designed to accomodate Western tastes, and is made by a separate team that normally makes the mainline MH games.
The trailer seems to confirm that the gameplay is changed in very notable ways.