they did work on it for the last 10 years when much of that time was in peak woketarded. with that said, rockstar doesn't release a game every year like ubisoft with assassin's creed. if they feel the story of the game will turn off the consumers, they will simply rewrite it. they would even postpone the release date if they needed to. gta is literally the biggest cash cow in all of media. there's no way they would fuck it up. i predict the story will be kind of safe but have fun gameplay, the open world taking full advantage of the next gen capabilities will be amazing and make rdr2 look like a ps2 game by comparison.
Canada