Okay, let's play.
We know Stranger Things so that is a given.
@Legacy said he was only confident in four and
@horrornights789 provided three additional IPs, only two of which Legacy said he was confident in. Therefore, we know of at least one other IP on the initial list that horrornights789 did not mention, but that Legacy is confident on.
Personally, I am thinking The Thing, because it is a Universal movie. Since it is not an outside studio, I assume that it would be easier to get the rights to. It has also been featured at the event in some capacity three times before if you count its appearance in Silver Screams