I thought Delta would have a good chance keeping the slot if it proposed a New York JFK flight (a new competitor on the route in an important market, and ironically one with much better connectivity now that the Department of Justice forced American and JetBlue to break up their partnership). I also thought that the best shot of winning would be new service from a market that currently lacks a non-stop to Tokyo, such as Miami (or Orlando).
However Delta is telling its employees that the slot will go to American or to United.