Hi!I have spent the entire day searcing ALL the forums and ALL the amber communities and I have seen ALL the theories about Ambers possibly return!And so here are them with my commentary!Say your theory in comments!

Theory 1:Hallunation of Wilson and/or House.
Possibilities:9/10.
Why it could happen:House is halluninating every 5 episodes its possible.And wilson may daydream her.It has happened before.
Why it won't happen:Oh pul-zee!It has happened like a BILLION times in the show!Tiresome enough?

Theory 2:Flashback.
Possibilities:8/10.
Why it could happen:Happened before.Gives closure.Probably Wilson's....