I debated with a friend of mine on that, and he thought that it wasn't while I was sure that Volcano's expansion plot would've most likely been there, even without that incite; only due to common sense.
Besides the family saucer/tornado's, it is a dead section of that park, and that it will probably be the first thing fully looked at for the park, when an expansion or new addition occurs.
One lazy river, to rule them all.