Board Thread:Spoilers!/@comment-24304025-20150202171011/@comment-24674051-20150330142025

Actually, based on the promos, it looks like Robin is going to have a very interesting adventure in Oz in the flashbacks. Which may make the choice of Zelena replacing Marian even less random than we thought. If Zelena has a beef against Robin as well as Regina, replacing Marian could be a way of "killing 2 birds with one stone". And in fact, maybe the fact that Marian was Ill and Robin needed the wand was a result of Zelena.

Just the breif glimpse in the Promos opens up so many possibilities. (and now we got to wait 2 WEEKS for the next episode.)