Subway began overhauling its menu in 2021, adding new ingredients and bread. The privately-held company, which is up for sale, has added meat slicers to 20,000 stores. The chain is giving away 1 million subs to mark the debut of new heftier, deli-sliced subs. Subway is giving away 1 million six-inch subs next week as the chain rolls out its third major menu overhaul since 2021.