There is a source on the internet that seems to be right more often than not, particularly regarding Universal. They were one of the first to know about the new park, one of the first to know about Nintendo plans, the Fantastic Worlds name, etc. It is to the point that I just accept what I see there.
And they did a pretty big reveal today...
The four IPs for the new Fantastic Worlds are:
Classic Universal Monsters
How To Train Your Dragon