The answer I believe is zero, and I want to check that before the misinformation hardens.
There are names circulating for both protagonists and for several supporting characters. As far as I can establish, none of them have been confirmed by Rockstar, and some of them originate from people reading credits that do not exist yet.
If anyone has an actual official source for any casting, I would like to see it.
Accepted answer
Zero is correct as far as I can establish and I have looked for the same reason. No casting has been officially announced for any role.
Coming to this later, but people asserting casting as fact in Jason threads is genuinely constant and this is a useful thread to point at.
Which is itself a choice worth noticing. Most publishers would put a name on the poster if they had one worth putting there.
Rockstar has historically not announced casting before launch at all. The credits are the announcement. That is unusual and it is consistent across their last several games.
Adding to the confirmed list: nothing. Which is the entry I expected and the one I wanted on record before November.
the names going round have been going round for years at this point and people quote them like theyre in a press release