Wow... somehow I missed this news yesterday. I can now taste the happy
Although, not to be a debbie downer, but part of me is wondering if the show got a full 4th season pickup because the writers show-runners told execs that they could wrap up the show in that amount of time, similar to LOST's pre-determined end date.
They might have pitched it as a nice, tight, 22 episode season, closing out the show on a high note.
Actually now that I think about it that isn't really a debbie downer scenario at all. Four seasons of Fringe is pretty darn good.