The two main reasons Guillemot gives for the long wait between games are pressure from fans, during the development of Blacklist, and the success of the Assassin’s Creed franchise.
Last time we did a Splinter Cell, we had lots of pressure from all the fans saying, ‘Don’t change it; don’t do this; don’t do that.
The developers were apparently so traumatised by demanding fans that they’re avoiding Splinter Cell like you avoid that one friend with the super-obnoxious squad, preferring the comparatively chilled company of the Assassin’s Creed franchise. Not that everyone was put off, since Splinter Cell designer, Clint Hocking, has returned to Ubisoft to work on “unannounced projects”. Guillemot confirmed there is work being done with the Splinter Cell brand, he just wouldn’t say what it was.
Now there are some things and some people that are now looking at the brand; taking care of the brand. At one point you will see something but I can’t say more than that.
Guillemot also says they want the new Splinter Cell to be something different. Battle royale, anyone?