The difference is that us ps3 players will have to wait 1 month before playing with the new mechanics and ps4 users will have the time to get the hang of it in 1 month. they are creating a (small) gap between players of the same region, so don't even compare the situation with sign, it's different. They aren't doing charity and they want to push the sales towards the new gen, I understand that, but ps3 users have the right to say "I don't think it's fair", since they're paying for the game too