So,

Based upon this link http://www.youtube.com/watch?v=mwjaSWWSD60 it would seem that someone (very unexpectedly) comes back (from the past / from the dead).

So, I'm curious: if it were an off the List candidate to be Red John (which I believe is still very much a possibility in play), I'm thinking Walter Mashburn (it interesting to note that on the following link http://thementalist.wikia.com/wiki/Category:Characters, the list of characters breaks out the list of seven separately from the litany of other characters, but Bob Kirkland is omitted whereas WM is included), or Brett Partridge (who despite being dead, remains on the list, unlike BK).

However, if not an RJ suspect, and it's simply intrigue (perhaps a plot twist), I'm thinking:

- Erica Flynn
- Kristina Frye
- Alex Jane
- Ellis Mars
- Lorelei Martins

Any other candidates?