I was just talking with a friend of mine in Cuba. He went to an interview to work at the new hotel opening (supposedly) December 2012. He said it will be similar to the Buenavista. Only 122 rooms. Adults only 5*.
The Royalton Cayo Santa Maria is situated between the pueblo la Estrella and the now HUSA Beach section. It will be administered by Sunwing just like Memories is and will have access to all services offered at Memories.
For a little more info, see: www.cayosantamaria.info/hotel_royalton.html