By Pat Forde The league is looking ahead to next season, the last before USC and UCLA join. The Big Ten unveiled its 2023 football schedule Wednesday, with three league games on the opening weekend—including Nebraska’s new coach facing a road challenge in his debut. The Cornhuskers open at Minnesota Sept. 2. Nebraska’s first two games are both on the road, with the second contest a trip to Colorado. Other league lid-lifters: Ohio State at Indiana and Northwestern at Rutgers. There are no conference games in week two and only one in week three—Penn State at Illinois. That will mark the Nittany …