Time will reveal all, right now the spread between the 2018 Demon and Demon170 is around 30/40K (both car values are fluctuating) and dropping. I wouldn't be surprised if the spread is within 15K within 12 months
Depends on spec imo.
All the people are horny for non sunroof cars and inflating their values.
I think a delivery miles d170 with no roof will probably get back to that high 100s possibly low 200s range come the next 12-24 months. Obviously depending on rates, economy, etc etc
But in general I see value going back up after the inventory dries up.