Sony (6758.TYO, SNE.NYSE) has postponed the launch of its PlayStation 4 and PlayStation Vita game consoles on the mainland, and a company source on the mainland has said prolonged negotiations with the authorities were part of the reason for the delay, South China Morning Post reported, citing various wire services. Sony said a new date had not been determined for the release, which the loss-making company is leaning on its gaming business to offset weakness in its mobile division. Beijing lifted a 14-year ban on gaming consoles last year, and Sony rival Microsoft (MSFT.NASDAQ) has already launched its Xbox One console on the mainland.