Despite the odd way Kojima Productions like to play with the English language (Revengeance? LaLiLuLeLo? Ground Zeroes) Phantom Pain looks to be the next game in this franchise... with series favorite SOLID Snake as the hero.
Gametrailers reveals that MGS V: the Phantom Pain AND MGS: Ground Zeroes are the same game, personally I hope they keep the Phantom Pain tag line as opposed to Ground Zeroes, the later sounds like some post apocalyptic mutant retro band...