What do you mean by "died with old Illusion" Something happen to game producer?
Old Illusion, or Illusion as they were known when this game was made, ceased operations or are set to do so, I forgot when that was supposed to officially take place.
As far as this and any other existing game, the rights to them will have either been passed on to another company, very unlikely to be Illgames, or will cease to exist making the assets of these games fully public domain in every way except the stance of their creators, which doesn't matter to copyright law.
Because Illgames, or the new studio founded by Old Illusion developers, is unlikely to get the rights to the old games, it is also unlikely that the old games will ever see an official update again.
That said, to expand on my original answer, the developers had already put one update out for this game and were already working on a completely new one at the time Old Illusion announced they were shutting down, so even if Old Illusion continued, it is unlikely this game was going to get another update officially. Yes, there was one time that actually did happen with the original Koikatsu getting the After Party DLC for its Steam version, bringing the After School DLC content into the Party version of the game, but this was an exception to what Old Illusion normally did, a surprise at best, not normal for them.