Now, that doesn't necessarily mean he was doing anything for The Batman. As fans have noted, he is also part of Christopher Nolan's WB film Tenet. As far as we know, The Batman won't start filming until this fall for a 2021 release, so if Robert Pattinson's set visit had anything to do with Batman, it could possibly be for another screen test or to sign papers, etc. That's all speculation, though. What we're waiting for is official word from The Powers That Be.