Sorry for the long post. But I believe this is how it's going to go down.

Patrick Jane is going to play the final game in the press conference in 'The Great Red Dragon'. The spoilers state that he and Lisbon will reveal the name of 'Red John'. Lisbon will believe this name is true.

Patrick is however setting up the final showdown, making sure the media, ALL law enforcement and his own team are sent on a chase after Betram or Smith (whichever one he reveals as his 'false' Red John in the press conference). This allows Jane the space, time and opportunity to draw the real Red John into the open: ending in Red John's death in a park - eventually.

Whilst lot's of excitement will be created as the police and media go beserk and hunt for 'Red John' (Bertram or Smith - whichever name Jane feeds them....), the real Red John will be drawn out in a desperate act to contact Jane - simply to tell him 'he has the wrong guy'. We know Jane has fooled Red John once (the drinking and breakdown), he can and WILL do it again by giving the false name 'very convincingly'. The real Red John, (even though he tried to kill Jane with the bomb...) won't be able to resist contacting Jane about some other 'person' getting credit for his work.
We know there is nothing Red John hates more. And if he is made to believe that Jane REALLY believes Bertram or Smith IS Red John - well, he will risk it all to show Jane otherwise.

By now, Red John has nothing to lose, neither does Jane. His attempt to kill Jane failed, and he's now planning his 'escape' into society and normality. The ONLY thing that will draw him out to Jane is when his ego won't allow him to accept that his friend/foe Jane is crediting someone else as Red John. And Jane: KNOWS THIS.

Jane knows Red John (the real one....) will only come out in those circumstances. His ego will take over and force him to reach out to Jane.

The scene with the final 5 suspects and the tattoo hocus pocus - for Jane it's been nothing more than an elaborate and convincing plan to 'give someone else credit for being Red John', making the real Red John believe this and thereby forcing his ego to expose himself, finally.

Enter Bob Kirkland once more. His hair has now been dyed (red probably) - ok, wild guessing here, but it sounds fitting.

Final showdown. Fight to the death.