I guess we now know how Marvel plans to handle the pesky “mutant” situation regarding Quicksilver and Scarlet Witch in the Marvel Cinematic Universe. Marvel has retconned the characters to no longer be mutants and no longer the children of Magneto.
The retcon happened in AXIS #7, which hit stores on Wednesday, where Scarlet Witch weaves a spell to strike down her bloodline in an attempt to defeat Magneto. When she cast the spell, Quicksilver was struck down…but not Magneto. Thus retconning the decades-old canon that the two are the offspring of the master of magnetism.
As for the mutant side of things? Well Marvel has been teasing a “No More Mutants” angle to the upcoming relaunch of Uncanny Avengers #1, which features the siblings. That means they are no longer mutants and their new origin will likely be established very soon.