Tyrannosaurus Azteca
Here is a rundown of the story from DreadCentral.com:
The film will document the (fictionalized, duh!) untold story of Cortes first scouting party to the region two years before his famed expedition that set about the historical events of 1500's Mexico we all learned about in school. Cortes and his small band of men will encounter a small tribe of Aztecs that speak Spanish, having been taught by a shipwrecked priest who must not have converted them to Christianity seeing as how they continue to worship a pair of male/female T-Rex's, the last of their kind. Much mayhem ensues and despite Trenchard-Smith's humorous retitling, it's safe to say that the infamous Spanish conquistador Hernando Cortes will not get eaten by the end of this film since history still requires him to go on to claim what we now call Mexico for Spain and bring about the destruction of the Aztec empire.
"You see old friend? I brought more soldiers than you did"