Awesome news! ^
With the best location for travel (across from the Stazione Centrale), this is a brand new hotel that was rebuilt inside of the gorgeous Belle Epoque outer walls of the old Excelsior Hotel Gallia. Almost everything except the facade of old hotel, including most interior walls and an ugly 1970s addition to the South, has been torn down and rebuilt, so it is truly a brand new hotel. With Katara's money behind it it'll probably be quite spectacular.
It's nice to see this property remain in the Starwood portfolio; there were rumors that it wouldn't.
PS It's not bookable yet and it does not have its own page, but it's listed at
https://www.starwoodhotels.com/corpo.../all/list.html