In the time it would take him to make a Halloween special he could finish Part X and at least not have to add another deadline he missed.
My thoughts on the big announcement?
Pick any of these:
"People, I finally learned Blender. Took me ages to find the damn "Render" button, but it's there and I can tell you I'm finally rendering those animations."
"Whew, after 2.5 years hiatus, I finally rendered a new image and I'm posting it today. That's right! It's finally not a rotated, zoomed-in crop that I was duping you with for the last three years, it's something new!"
"I finally moved in to my mansion. I paid cash and it was only possible thanks to you, suckers."