I don´t think this story will be about undong the retcon and I don´t want marvel to undo it just so Wanda and Pietro can get back into yelling at Magneto and blame him for everything wrong that happens on their life or when they need a excuse to blame the OC behavoir some of their writers use them for if that´s the case lest keep them far appart from each other, marvel would just need to start using Wanda and Pietro on the Avengers titles while Magneto keeps himself on the X-men side but if they want to they can make them mutants again, just not Magneto´s children.
If they actually make an effort to develop an interesting story between Wanda, Pietro and Magneto and bring something new to the relationship or at least something that adds characterwise to them then I would agree to see the retcon be undone.
Now about Magneto´s trial, I just remembered JDW said some weeks ago they would revisit what happened at the end of Age of X-man, where Magneto made a deal with X-man so they would not need to destroy the world Nate created but they hide that fact from the X-men and now there´s two Magneto´s one on Nate´s world and another on the main X-line, I wonder if the trial has somethign to do with this.