On the subject of Fringe on home video, have other Bad Robot series had extra features when they received a complete series release? That might be a good barometer if you should buy the season sets now, or wait for the complete series in a year or so.
did, and I think Alias
did - but those were both released by ABC/Disney. Fringe
is the first WB release; you'd be better off looking at past complete WB releases (which haven't generally had extra content) for a clue in this case, I think.