They have been marketing it... in Japan. They put out an official press release with the new concept art late last year and local news outlets have been covering it. The buses on property have the wraps on them so people see those driving team members back and forth. And I bet billboard-type ads will likely show up around the area over the next few months.
It's not like we're going to see commercials in the states for it, or a blog post on the Universal Orlando site.
Yup, people in the US see Nintendo and Universal in the same advert and they book a vacation to Orlando thinking that's where it is.
Great for Universal that they get a sale but incredibly bad when they have the headache or idiots showing up because they didn't read the whole thing.