The fact people are still on about 1B dollars IPs and what not? If its seriously just about the money, Comcast would have gotten MLP rights long ago. However, its not about that.
Lets look at all of Comcast's interesting choices in the past few years. They bought an anime company, they partnered with Nintendo, they partnered with Sanrio (Hello Kitty), most of what they have been doing is niche and don't truly fall into the mainstream. I think this park definitely will have IPs but maybe not Harry Potter level but through the use of synergy make those IPs big.