After several delays, W Panama in Panama City, Panama, is now listed with a February 15, 2018 opening date and accepting reservations:

W Panama

The earliest available reservation is March 1 at $180/night. It’s unclear if the hotel is sold out from Feb. 15 to March 1 or if there’s been a further delay until March 1. (The latter is my guess.) Either way, it appears the opening is imminent, as reservations are being accepted for dates less than a month into the future.

I’ll be in Panama again on March 1 and plan to check it out.