Fabula Nova Crystallis Final Fantasy XIII
It's a collection of 3 games in which Square Enix plans to release, either this year or next year. These games have no direct relation to each other what-so-ever, it's more so 3 games that share a common mythology. The background of each game is based on a crystal, but for each game, the plot develops it's own story in relation to this very crystal. These games all take place in the same unvierse, but never cross. So basically, it's just 3 games, of 3 different stories, in 3 different worlds, being told at the same time.
The trailers are VERY interesting so I recommend you watch them.
If you've already seen them, looks good eh?
If not, then you should because it passes the time and Square Enix gets to show off their famous cutscenes.
Final Fantasy XIII (PS3)http://www.youtube.com/watch?v=vv5Gc2E9dB8&feature=relatedFinal Fantasy XIII: Versus (PS3)http://www.youtube.com/watch?v=TOC8wDxwmLE
http://www.youtube.com/watch?v=_qKmTomLa4IFinal Fantasy XIII: Agito (Mobile)http://www.youtube.com/watch?v=1Ds3A50U1e4&feature=related (no official video, just a fanmade slideshow)
In my opinion, Versus looks the best by far, but that's because I'm a lover of tragedy and this story is supposed to be very tragic indeed.