The guy (his name is Bob) at the end of the episode 7 season 5 is very suspicious; his height and his voice are similar as Red John. Moreover the: - do I know you ? Jane says 
                                - No, but I know you, Bob says

The music is very suspicious as well.

I know this is not a good theory, but I think we should take a greater interest of this man even if it's not Red John, because it's the first time we see him and we know that we have already seen Red John in the previous episodes, so I'm sure that there is a link between this man and Red John.