I'm doubting they are going for the reality-warping Scarlet Witch. Since it has already been stated that this has connections to the Dr. Strange sequel, I'm guessing it will have something to do with trying to bring the Vision back without his connection to that stone since that's what powered him in the first place.
They never went into any actual detail with how it happened, but Wanda and Quicksilver in the MCU somehow got their powers from the mind stone also. Never really made a whole lot of sense, but there's an added connection there between Vision and Wanda.