We're still a long way out from Pitt leaving the Big East and entering the ACC because of a long buyout period, but the Conference has already made plans for Pitt and Syracuse when they do get there. They offered a press release that says Pitt will be jointing the Coastal division of the ACC while Syracuse will be joining the Atlantic Division. It also has some details on what the Conference football schedule will look like.
When Pitt and Syracuse join the ACC, the league will play a nine-game conference schedule. The format will consist of each team playing all six in its division each year, plus its primary crossover partner each year and two rotating opponents from the opposite division. This six-year cycle allows each team to play each divisional opponent and its primary crossover partner six times (three home and three away) while also playing each rotating crossover opponent two times (one home and one away).
That means that Pitt will be in the division with Virginia, Virginia Tech, Georgia Tech, Miami, North Carolina and Duke; meaning they will play each of those teams during every football season. The other teams will be incorporated as part of a rotating schedule.