In regards to whether Fringe has been renewed for Season 5 --
Joel Wyman tweeted late last night (or early this morning depending on your time zone)
JOEL WYMAN @JWFRINGE
We might hear something tomorrow. I know you're all anxious.
Kind of just like a Fringe episode, leaving us restless and wanting to know more as soon as possible. Fitting in a way. For me it's become of those I want to know but do I really want to know issues. If the answer is Yes then of course I want to know. If not, I think I would like to continue trudge that tried and true path of ignorance is bliss. Albeit anxiety-inducing, fingernail chomping, suspense filled "bliss."
UPDATE: Fringe was renewed for a 13 episode run for its Season 5. This will be the final season.