Updated: It's since been discovered that the poster Johns released was merely a fan-art poster.
Original Story: DC Entertainment Chief Creative Officer (and comic book writer) Geoff Johns has tweeted what appears to be a new poster for Batman v Superman: Dawn of Justice.
March is close. pic.twitter.com/bcfa4v5PYo— Geoff Johns (@geoffjohns) December 16, 2015
Batman v Superman: Dawn of Justice opens in theaters March 25, 2016.