Honestly, the trial Already Happen in the pages of Children's Crusade, things went really in-depth and an argument happen several times in that book, so really that was the Trial book by Marvel. So IMO, in Marvel's mind it already happen and they seem to feel no need to revisit it again and that makes sense IMO cause they already told that story. Really it makes no sense now, non of the Character are going out for another Trial run story.
If someone has not Read Children's Crusade I Highly Recommend it!
http://www.amazon.com/Avengers-Child.../dp/0785135499