No, Square Enix isn’t making Ninety-Nine Nights 3, but they filed a trademark that sounds like a similar style of game. In Japan, they registered Champion of Ten Million for use with video games and a game with 10,000 troops makes think of one particular and quite popular series. Any other guesses?
In other trademark news, Namco Bandai filed a trademark for Everyone’s Solitaire and Gorgeous Solitaire which sounds kind of self explanatory!