I don't want to give out why or anything about the video. The surprise is too much of a fun "Yipes, wow!!!" thing. The only thing I'll say is that this is SO weird because I have no idea how or why the company -- Xfinity -- got permission to from the rights holders to do this. They've been pretty protective for over 35 years. In the end, this is like a trailer for a sequel to one of the most famous movies ever made, with some of the original cast.
It should be noted that Xfinity is owned by Comcast which owns Universal that made the original movie. So, that clearly helped -- a lot. But the biggest hurdle was probably getting the film's director on board, and he not only gave his approval, but was consulted throughout the project. And one of the actors who was involved with the short film commented, "The audience is going to get everything they want out of a sequel without the messy bits that could destroy the beauty of the original and the special place it has in people’s minds and hearts.” The ad doesn't really seem to have all that much to do with Xfinity except in the most general, tangential way -- but will no doubt get them a lot of attention, which ultimately may be the point.
I shall say no more.
My suggestion is to click to double-arrows in the lower-right corner of the video viewing box to make the image go full-screen.