First of all i Love KQ2015 especially the Routes and sure im a little bummed about how Short Ch3 is with its constant cutscenes and even less playability. Yea Ch3 is even Shorter then Ch2
KQ2015 gave us Routes (Bravery Wisdom Compassion) to play with and im very happy with them and did them all in Ch1 & Ch2 and im a guy that sticks with the Route i play instead of going another way and coming back or going completely off track.
Now we have Ch3 with only 2 Princesses and 4 Save Slots which means you have to Replay Ch3 over and over again to play (Bravery Wisdom Compassion) with just 2 Princesses. I would've been fine with 1 Princess or 3 actually which should've been.
KQ2015 is Story Driven, so how is the Routes with 2 Princesses gonna work in Ch4. Your gonna Replay Ch4 Ch5 Epilogue to continue the Previous Routes over and over again till your sick of KQ2015 because Ch3 Only introduced you with 2 Princesses.
At the end of Ch3 we see the Tower get all Frosty where as the hand of one of the Princesses gets caught and is turning to ice which indicates a Clue that she might be the Ice Queen in Ch4 since after the Credits we see Graham standing on a Snowy Foreground with an Ice Palace in front.
Ok where does the Third Princess even come in you ask, well if there was a Third Princess she would be completely frozen in ice like one of the Sisters in KQ7 where Valanice found her in ice in Dream World.
So technically speaking, Graham saves a Princess with one having her Hand in Ice and the other one simply being Dead in Ice.
The Third Princess could be called Anise in which at the end of the Chapter we find out she is also called Valanice.