The Mermaid rooms will be in demand because they offer the themed rooms in the value tier. There is no other value property doing this currently. In the moderate level, there are several themed rooms available.
The Mermaid rooms will be popular because of that, more so then the actual property IMO. The property itself looks marginally better than the other values.. but not enough IMO to pay a significant increase for. The different room styles will be a large part of the demand (and of course that its the new location, etc)
The suites will be in demand on their own simply because of the # of people that can stay in them, plus the kitchenette. As a family of 5 or more, you are limited in the room options you can have. The suites offer the space with some different ammenities.
The suites are not a mistake by any means and will fill based on the demographic they target. Mermaid will be popular for those looking for a better room but staying within Disney's value price tier.
