User blog comment:SLyfoX999/Returning Characters in GTA 5?/@comment-5364002-20130812183933

CJ is a no-no for GTA V. And so are Sweet, Kendl, and so on, and so on...

Of course there will be LOTS of Easter Eggs mentioning them, but they will definetely not return as NPC's. CJ may be available in Grand Theft Online (GTA V's Multiplayer), but not in the storyline; I can assure you.