Quote Originally Posted by Kawaii Ryűkishi
He's still officially referred to as a bunch of question marks. So, no, it hasn't been confirmed.
Magazine scans in Jump magazine aren't official material. The cast list given out at the preview shown at the Venice Film Festival was. (SPOILER)Said cast list makes note of "Rufus Shinra" having been in the preview. Taking all other characters present in the preview into account, the only one that could have been Rufus was the Wheelchair Man.