Vidanta World's design is now confirmed to be by Hetzel Design. Their website contains some never before seen concept art and the following description of the project:
There’s magic and wonder brewing in Nayarit that might just bring about a revolution in entertainment. Already stunning, the high-end Vidanta resort in Nuevo Vallarta will double in capacity over the next three years. A world-class theme park, and an entertainment boardwalk featuring a major Cirque the Soleil attraction will anchor this new development. This new concept in family vacationing will fuse luxury with imagination, creating a fantastical world where adventures leap to life through immersive rides, attractions, and interactive performances. Highly thematic new resort hotels will surround and compliment the entertainment hub, so that every moment of the vacation experience is filled with magic and amazement.
Hetzel Design is also doing the design of the adjacent agriculture/nature park which they refer to as "Garden of Senses" or "The Land of Senses":
A true eco resort nestled between a river delta and multiple lakes just minutes away from the ocean, the Garden of Senses celebrates nature and lives in harmony with local vegetation and bird habitats.
A small entertainment village is a dispatch center for numerous adventures: boat dinner tours on the lake, zip lines, biking, hiking, tractor trailer farm rides and an immersive nighttime “Lumina” experience!
Sources: http://entertainment.hetzeldesign.com/portfolio/vidanta-world/ and http://entertainment.hetzeldesign.com/portfolio/garden-of-senses/