At the time of this post (May 2013), I’m working for a year on this pet-project during my spare time. If it ever gets released, its going to run on ios and android devices. It involves a team of motivated individuals cooperating across the internet. Progress is really slow due to limited resources.
2015 Update: The project is discontinued.
It was an infinite-runner type of game, procedurally generated, fully 3D with what one expects to find in a ninja game: fighting, evasion, bosses (inspired from Japanese mythology) and different levels that are different every time you play them. Maybe somewhat ambitious for a spare-time project. We were very close to a demo though.