The problem with the PS5 launch is the component shortages which basically get taken away from the system along with higher cost sourced components/architecture. I don't think the launch PS5 is going to be what they wanted to put out because of the problems acquiring what they wanted, and having to raise the price just to get what they can. They should have waited until December for release to see if those extra few months could have made a difference.
Even if Xbox Series X YZ123 launches earlier it's not the favored system and I'd rather Sony put out the best possible hardware from the start. Either way we're likely in for another mid-system upgrade if that's the case. They were going to include that mirrorless camera with the system but outside of VR enhancement I think it wouldn't serve a purpose for most people. Sony is better off leaving it out and saving it for future integration.
As for the Pro, $300 is the price is should be standard but they want the base PS4 at that price for as long as they can. If GameStop was doing the $50 bonus system trade-in credit I would be tempted because we don't have concrete specifics on PS5's backwards compatibility. I really prefer hardware BC over software but they say that costs more, and if the PS5 enhances games as well if not better than the Pro there is no reason to get the Pro. Of course the Pro only plays PS4 games though.
Sony doesn't want to reveal too much too soon because then they're going to be stuck with what they say, and if it doesn't end up being the end case that's how quickly customers will flip on them.