Merchoid has the first officially licensed Batman v Superman: Dawn of Justice t-shirts available for pre-order now! There are four designs in total, and they are expected to ship at the end of January.
The designs really play up the whole Batman vs. Superman thing. There’s an anti-Batman shirt that calls him a “demon”, and an anti-Superman shirt that calls him a “false God”, like we saw in the first trailer. I know which one I’m getting! There’s also two cool designs that feature the Batman v Superman: Dawn of Justice logo.