Being that monsters is utilizing the KUKA arm, I would bet on that and the main Harry Potter ride to be the big draws along with the Nintendo World itself (if many don't care for the main ride, like Gringotts, the land is still amazing and interactive). I'm actually really excited for the Monster's ride as I think the only other ride to use this system is in Dubai and unavailable for POV's. There are so many rumors though we may have a few sleeper-hits.
I agree, I think the lands look pretty strong including the hub which contains rides and the ride count is already rumored to be up there with other parks. They have so much expansion room that if the lands don't appeal to one today, they may have a land that will in the future.