I'm not sure. We see Wally's first Kid Flash costume in the DC Rebirth, unchanged and without the Jim Lee lines or chinstrap. And Barry's old costume was in a splash page on Rogues Reloaded, though I'm not sure how canon that is.
Superman in his bright blue spandex and trunks at the center of this image would be really out of place, though. I can't really see Superman, Doctor Fate, and Hawkman being the only guys with their Pre-Flashpoint looks.
I think whatever's going on with Rebirth, we'd have to wait until the end of Doomsday Clock, or if that starts an event, the end of that event.