In this year's E3, Sony revealed that Final Fantasy Versus XIII is still alive and will head to the PlayStation 4 as Final Fantasy XV! In addition, a new gameplay trailer for Final Fantasy XV was seen in the said press conference.
Final Fantasy Versus XIII was first announced in E3 2006 as part of Final Fantasy XIII's series of games called Fabula Nova Crystallis: Final Fantasy. Conceptualized as an original story taking place in the Final Fantasy XIII universe, development for the said game lasted for almost 6 years.
Source: Siliconera; additional info about the game's developement from Final Fantasy Wikia
Final Fantasy Versus XIII was first announced in E3 2006 as part of Final Fantasy XIII's series of games called Fabula Nova Crystallis: Final Fantasy. Conceptualized as an original story taking place in the Final Fantasy XIII universe, development for the said game lasted for almost 6 years.
Source: Siliconera; additional info about the game's developement from Final Fantasy Wikia