Because... because, you're getting two different Hercules movies this coming year; one directed by Renny Harlin (remember when he was interesting?) which features B-movie martial arts star Scott Adkins (yay!) but NOT as Hercules (boo!); the other featuring The Rock (yay!) but directed by Brett Ratner (boo!).
This is the trailer for the Harlin version, which looks like one of those YouTube "fan-trailers" made out of other movies. Have fun picking out which shots/scenes/compositions/etc were taken from "300," "The Hobbit," "Gladiator" (the film doesn't seem to grasp that Ancient Greece and Ancient Rome were two different places and eras in history) "Troy," "Immortals," etc.