Jay Mohr, who worked in voice acting under Volition for Saints Row 2 in 2008, tweeted that he is back at their studio and working with them on a new game.
"About to do my voice over work for new Saints Row video game. #showbiz"
~Jay Mohr's Twitter
It is unclear whether this could be an unannounced DLC or new Saints Row title all together. And given a successful release of the previous title, it is likely we will see another Saints Row game. This will mark the first step in it's new direction on Next Gen.
Source(s): http://www.ign.com/articles/2013/12/20/saints-row-new-game-confirmed-by-voice-actor?abthid=52b468c4d04f3d164a000008
https://twitter.com/jaymohr37