The website for this property just went live on Marriott's directory and can be accessed at the link below. Still light on info and only has the W brand placeholder images - as well as a curious "W Osaka City Japan" name so I suspect that more updates are coming soon to get the page in line.
https://www.marriott.com/hotels/trav...ka-city-japan/
Opening February 2021 with 337 rooms, at least three restaurants and an indoor pool. I reckon this one will be at least a Category 6, if not 7.
khabah