It would appear that Square Enix have trademarked a new Deus Ex Game. (Deus Ex: Human Defiance)
This trademark also indicates that this potential new addition to the series may in fact be a direct sequel to Human Revolution as it follows the naming conventions of the previous game. Fans of the Deus Ex series should keep their eyes fixed on E3 2103 for a possible announcement!
The trademark was filed by Square Enix on February 26th 2013.