The third Kharacter to be unlocked, Rain is joining the Kombatants on July 19th.
Rain, who is apperently half god prince (ha, Purple Rain) of Edenia. Will join the Mortal Kombat Tournament with all his old tricks, including shooting lighting, and his super round-house kick that made him so famous.
You can pick up rain on July 19th for 400 point ($5) or with the season pass.