Rafael Grampa illustrated this month's Batman v Superman variant for Detective Comics #50, but it looks like the Brazillian artist is thinking about some other characters in the DCU. Grampa has posted two illustrations redesigning the Flash and Nightwing.
Grampa stated in December that he's working on creator-owned projects in film and comic books. However, it's conceivable that Grampa could be involved in DC's line-wide reshuffling of creators for Rebirth.
But given DC's upcoming Rebirth creative team announcements on March 26, it's always a possibility he could be up to something else with the publisher.
Grampa's sole interior work for DC was a short story in 2013's Batman Black and White #2.