Oh goodness! It appears new characters are set to be added to Ikémen Sengoku: Kichou, Maeda Keiji, and Naoe Kanetsugu.
With the recent release of Mitsuhide's route and knowing we still have Kennyo, Ranmaru, Yoshimoto, and Motonari's routes to [eventually] look forward too. However, with Naoe being added to the mobile platform, it appears we may be following the PS Vita version with available characters.
In a possible future, we can predict the addition of Maeda Keiji and Kichou may join the romanceable race of Ikémen Sengoku. As we all know, it can take three months to a year before we receive new routes in the English localization of the game, so I wouldn’t be surprised if it takes two years or more before we see Naoe added into the storyline.
Here is a timeline chart viewing the release dates for previous routes (Japanese vs. English localizations) and approximations on when we may receive new routes (TBA routes are in no particular order):
Walkthroughs for Ikémen Sengoku: