Above is the cover for the first volume of the light novel series Hentai Ouji to Warawanari Neko by Sagara Sou, winner of the 6th annual Media Factory Light Novel Best New Author award.
The title's official translation of 'stony cat' seems to stem from the term 'stony-faced' (also, 'stone-faced'), meaning expressionless. This matches with the character description given by Media Factory as 無表情 (muhyoujyou - expressionless). The first volume will go on sale October 25th, 2010. As with other works by the Best New Author award winners, this series is expected to receive manga and/or anime adaptations.