For now, the story is told best via the Kickstarter campaign, run in Sep'-Oct' 2015.  It was a fantastic experience!  Lots of gameplay info and pics can be found there, as well as on Board Game Geek.  

As of May 25th, 2016, Agility is officially released!  We'll have more info coming to this backstory page once things quiet down a bit.  Thanks for checking it out.