He's in his mid-40's, so I doubt they take him back on the main roster. The "Shawn Stasiak Comeback Story" doesn't seem like something that WWE would find enthralling (and neither would I... they should focus their attention on the younger talent like Ambrose, Reigns, Rollins, Wyatt, Bryan, etc. rather than a middle-aged talent who was treated as a joke back in the day), so his best bet is probably being hired as a trainer and part-time talent in NXT, ala Rhyno. William Regal promised recently that there could be more veteran talents coming into NXT soon, so Stasiak could be brought in as one of them.