TVGuide: 

Any scoop on The Mentalist? Is Jane really going back to jail? — Elizabeth
ADAM: Get ready for another — albeit less severe — time jump. The next episode skips ahead three months, and Jane has indeed spent the intervening period in detention. (And Lisbon's been writing him letters! Aw...) However, the always wily Jane already has a plan to get out. Let's just say that some pieces of the Red John puzzle from earlier this season may be Jane's saving grace.

From what TVGuide says, it seems like Jane will get out of his FBI problems by explaining at least something from the Red John episode.  Lol, maybe he'll confess to Lisbon that he faked RJ's death and the two years in South America were an elaborate con to really fool RJ.  

So very, very unlikely . . . 

Would any of us be able to forgive Heller for messing with us like this even if he did manage to have a brilliant RJ reveal at the end of the season?  Green: yes ; Red: no