Thanks to Yukira, a friend of mine, I finally got to see some scans regarding this upcoming game.
According to the scans, the protagonist this time will be a platinum-haired guy named Kisakinomiya Chihaya (lol, even his name is girly already), and the heroine will be Nanahara Kaoruko (the black-haired one), and she's of the strong will type. It appears that the story will take place after the previous game, with totally different characters. Well, at least let's hope this will be as good as Otoboku 1. Cheers.