Despite being the Switch 2’s leading launch game, Mario Kart World hasn’t gotten much in terms of proper new content. But update 1.7.0 just dropped for the game, and it adds two Knockout Tour routes for players to burn rubber on. The Drill Rally starts at Wario Shipyard and ends in Bowser’s Castle, while the Boomerang Rally extends from Salty Salty Speedway to Whistlestop Summit. Nintendo’s website mentions that additional routes will be added in future updates, and the game’s…