Having just returned from the Westin Nusa Dua and enjoying the beach I'm excited to see a W in Bali. Seminyak hmmmmmm..... factoring that in.... but it is a retreat property.........
I say Cat 5 to start and rates starting at $225 or so for standard rooms. That is a safe guess.
If they make this a Cat 6 and shoot for the stars they maybe missing a large portion of guests who either won't redeem Cat 6 point levels or $ of more than $350 or so.
Thus I think Cat 5 to start.