Director Zack Snyder released a teaser for Batman v Superman: Dawn of Justice through his Twitter, and simultaneously confirmed earlier reports that special IMAX screenings of the full trailer are being held on April 20th. The video is 21-seconds long, the majority of which are logos, and features Superman and Batman’s suits without actors Henry Cavill and Ben Affleck in them.
While the teaser is the first official footage of Batman’s suit (and presumably the Batcave), the shot of Superman’s suit is merely a recycled shot from the scene in Man of Steel where Clark meets Jor-El. I rewatched that scene to confirm that, but another dead giveaway is the fact that the “S” emblem on the chest doesn’t have the extra lines in the middle that the new version of the suit does — which coincides with the more textured Batman v Superman logo — or the extra blue layer/border underneath the House of El emblem. Below the tweet, I've included a side-by-side comparison of the old suit featured in the teaser and the new suit so you can see those differences for yourself. Below that we've included screencaps from the teaser.