On its website, the firm of Guy Butler Architect LLC has four renderings of a Marriott Vacation Club resort in Cancun:
http://www.guybutlerarchitect.com/portfolio/resorts/cancun.html
However, Marriott Vacations Worldwide (VAC) has not announced a new property in Cancun or anywhere else for years.
VAC needs to have Trust inventory to sell. The spin-off company (from Marriott International) began life with a boatload of unsold inventory. Presumably, this inventory is being sold down and will need to be replenished over time.
VAC can build out Ko Olina, Las Vegas, and Orlando (Lakeshore Reserve). The land, plans, and infrastructure are already in place. And these are all popular destinations.
There are ways other than new construction to get "points" into the Trust. With a large base of existing weeks and points owners whose needs change over their lifetimes, VAC can acquire plenty of inventory through ROFR and buybacks at less than the cost of new construction.
I've heard some of the "future locations" in this thread mentioned at sales presentations for 20 years, especially New York City and the the Big Island of Hawaii.
The Marriott Vacation Club portfolio had been stagnant for quite a few years now. I think there will eventually be more locations. Adding properties at popular vacation destinations would not only provide more inventory, it would also give Marriott Vacation Club a stronger portfolio to pitch to prospective buyers (including current owners). And there would be more sales locations. But VAC appears to be in no hurry.
If a Marriott Vacation Club salesperson is pitching points based on fictitious locations, shame on him or her.