As reported by Deadline:
Warner Bros has set Kevin Hart to play the fight promoter who gets two retired brawlers back in the ring in Grudge Match. Robert De Niro and Sylvester Stallone are now set to play the fighters who square off in the ring, and the studio has greenlighted the film that will be directed by Peter Segal. Entourage architect Doug Ellin wrote the most recent script draft and Billy Gerber and Mark Steven Johnson are producing.
As you may have deduced, this is Rocky and Jake LaMotta finally going at it. I'm imagining the trailer for this to have many a De Niro, old-man LaMotta hooks, water/sweat slo-mo moving out of the jaw and all. Should be some serious cheese, that brings in some serious dough and/or award hype.