Will Steve Carell appear in The Office series finale?

From TVLine:

Insiders tell TVLine that producers mounted an 11th hour effort last month to coax [Steve] Carell into making a cameo in the show’s hour-long swan song. And while no one is confirming that the final diplomatic push proved successful, no one is denying it either… a source close to the show cryptically teases, “Don’t rule anything out.”

Link: Is Steve Carell Returning for the Series Finale After All?

What do you guys think?