He lists Quebec, Kansas City, Seattle, Suffolk County, somewhere else in Nassau County and the popular suggestion of Brooklyn.
Over the weekend it was written that the arena in Brooklyn would only hold 14,500 for hockey. Mikhail Prokhorov said that he doesn't want to buy another sports team.
More on the Isles Arena saga, here.
I don't think that Brooklyn is a realistic option at that seating capacity and the apparent lack of interest from the Prokhorov/Nets side of things. Queens is the best option as it could be close to Citi Field and it's easily accessible from the LIRR and subways. There are options in NY that come before relocation, but there are cities that are waiting if the Isles can't find a deal somewhere.