If 4. is true, I might not play it.
The thing I mainly disliked about GTA 5 (in my opinion worse than San Andreas, GTA IV and Vice City in that order top down) was that multiple character system.
Such a system keeps you distand to every protagonist you play (you are more like a spectator of the 3, rather than having the feeling of being the protagonist), which kind of keeps you distant of the story and the atmosphere the game tries to transfer.
I really hope they will return to one protagonist you kind of can identify with and develop as you desire, kind of like in San Andreas.