Re: What we know about Thor 2 from the Avengers...
It would depend on how much they use him I guess. From what was said between Loki and The Other in TA, I think it should be addressed. It could be that we see Thanos or hes just behind the scenes and sends others after him. Something with him should happen, even if its a credit scene. I think they should at least tease what hes capable of.