It looked to me that future Jean is grown up Teen Jean. So if her powers prematurely blossomed with her arrival in the present time it would seem her powers continued to grow exponentially.
Originally Posted by OutcryX
so future Jean is so powerful that she has to wear a Xorn helmet to keep her awesome abilities at bay....?
But you know, after reading this week's issue I'm starting to side with Rachel and not trusting these future X-Men.