Hayes didn't return to voice the new episode, but there's widespread speculation that the mischievous Stone and Parker used creative editing of his voicing from past shows to fashion new dialogue.
Comedy Central on Tuesday began running promos of the episode that featured what appeared to be Hayes' voice.
OMGG rack Matt and Trey ALL hail the servents of Xedu LOL!
I am so geek up watch this episode NOW Can't waittttt