Whirlpool announced their 9th and latest project on their website. Usotsuki Ouji to Nayameru Ohime-sama (うそつき王子と悩めるお姫さま) or literally A Liar Prince and Harried Princess. Original Illustration still on Tenmaso (well Whirlpool is Tenmaso :D), planning to release in this autumn (2013) though didn’t clarify the date
for more information about the game (thought it didn’t give much the information now) visit their web here