If the unconfirmed prices are accurate, then we can expect the Core i7-8750H and Core i9-8950HK SKUs to retail for approximately $2600 USD and $3500 USD, respectively, with a 144 Hz IPS 1080p display. The Helios 500 looks to be a completely new design compared to the existing Helios 300 with even larger rear ventilation grilles.
https://www.notebookcheck.net/Polish-retailer-leaks-Acer-Predator-Helios-500-with-Intel-Core-i9-promptly-pulls-down-listing.293778.0.html