The Motion Picture Assocation of America (MPAA) has released a bulletin highlighting the films that they've recently rated, and Batman v Superman: Dawn of Justice Ultimate Edition has been slapped with an R-rating for "sequence of violence". The distributor is Warner Home Entertainment, so it sounds like we're getting an extended director's cut Blu-Ray from Zack Snyder!
There’s even a note that reads “EDITED VERSION. CONTENT IS DIFFERENT FROM PG-13 VERSION, BULLETIN NO. 2393 (9/30/15).”
I hope they'd release that version in theaters. With Deadpool's success at the box office, it just makes sense that R-rated comic book films would draw more people than if it was released years ago.