User blog comment:GraveEclipse567/Another rumor for a Sonic reboot, based from Summer of Sonic's facebook./@comment-477304-20130416212916/@comment-477304-20130416224400

It being Metal Sonic seems possible, despite the fact that last time he was seen he was intact, albeit ripped open by his own hands. He also appears to be still functional.

Somthing in relation to StH4: Episode 3 could also be possible though.