The Miami Herald broke the news that the Vista will be homeported in Miami, FL. That is of course after her inaugural season in Europe, then her christening in New York. The deal that Carnival and the Port of Miami agreed to mandates that Carnival sail the Vista 24 times out of the south Floridian port in a three year period.

It should start her Miami service in December 2016.
If anyone’s interested in see what one of these agreements is like, then here it is.

Miami Date County(PDF)