Yes, they're both being developed by Rockstar, and yes, they both will feature bullet-happy antiheros. Those aren't the answers I'm looking for however.
No, what
Max Payne 3 and
GTA V have in common is that the multiplayer "Crews" that develop during
Max Payne 3's multiplayer will carry over intact to
GTA V via the Rockstar Games Social Club - that's assuming the Mayans were wrong, of course.
These Crews are more than just clans. You'll be able to join large public Crews or create small private ones that you and your friends can cutomize.
For full details, check out the Rockstar Games
newswire.