Not a 918, but the GT4 ePerformance. They are not calling a 718. I think what ever the new electric Boxster/Cayman will be a completely new chassis. Shape might share the ICE cars, but that will be it.
https://motorsports.porsche.com/international/en/category/cars/gt4eperformance
Yes, time to sell. I sold my MY18 718 Cayman GTS in December, the garage has an empty bay waiting.
Used car market is so crazy, the 718 only cost me $4k for 3 years. Even the 4 cylinder prices are nuts.
981 market here in the US is hot right now.