The second episode has been posted, and it's much better than the first one. The word on the street is "newspaper", and it includes a cartoon in which a man looks in a newspaper and sees a used monster listed in the want ads (this looks new, but has a classic quality to it... And I don't ever remember seeing it before), plus a classic Two-Headed Monster sketch, in which the monster uses a newspaper. I don't remember seeing that sketch before, or hearing about it, but the monster is performed by Jerry Nelson and Richard Hunt in that sketch, so it must be older. And it includes the sketch where Grover sells newspapers, which features Sully in the background (though the beginning scene is cut. I recall Sully walking past Grover at the beginning, and this part of the skit is in the Grover Work Song montage in A Celebration of Me, Grover! but there is a shot of Sully).
So I guess classics will be included. I don't know how old that Two-Headed Monster skit is (it could have been between 1990 and 1992), nor do I know how old that Grover sketch is (I think it's from the 1990s).