IV had about 4-5 trailers. I'm going to assume that GTAV's next trailer will have a different character narrating. It makes sense to have a unique trailer for each character and his basic back story. Maybe it'll be a trailer displaying the size and scope of Los Santos and it won't have a character narrating at all?
Who knows? We'll just have to see!
Wiseman say, forgiveness is divine, but never pay full price for late pizza.