I'm posting this recent interview of Bruno Heller for "Templar", since he mentioned he can't post, along with some comments of mine:
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Since The Mentalist hasn't been renewed yet, will the writers finally
get Jane and Lisbon together in case the show's canceled? — JackieFunny
you should ask, Jackie. "It's a romantic finale rather than a
[suspenseful] finale," creator Bruno Heller says. But that might not
mean exactly what you think. In fact, after a quick courtship, Agent
Pike will propose to Lisbon. Will Jane give the couple his blessing, or
will he decide to confront his unresolved feelings for Lisbon? Either
way, Heller promises closure. "With the death of Red John, there's a
sense of tying [things] up and certainly this romantic angle is one of
them," he says.
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What  relief! Thank god they're planning on tying up the Jane-Lisbon
loose end! The culmination of 6 long years is finally before us! The
saying "the night is darkest just before dawn" had never been so true.
Finally a ray of sunlight is on the horizon.

Nothing like covering such pivotal plot holes. The show would lose credibility otherwise :O

He promises closure on this quintessential matter as well. I trust Bruno Heller to deliver once again.

The Mentalist ladies and gentlemen. An 138 episode - long chick flick.

Let's
hope Jane and Lisbon ride the Citroen towards the sunset (which of
course will be deep red, just so they can crap on our faces on last
time).