AHAHAHAHAHAHAHA, the back of the flyer which they hinted would be something surprising was:
Pic credits to a certain community fujoshi, Siho, who spotted the flyer at Big Sight♪
NEW CHiRAL GAME IS ON ITS WAY WTF WEU(WE()AWE()WA()EWAE
We all (us happy fujoshi and fudanshi) have a mutual feeling that this one's not Mobile this time♪ (Twitter exploding at real time now lol)
AHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAAAAAAAAAAAAA *exploded*