Here are some cars that I hope for return in Forza Horizon 5 as purchasable Autoshow cars:
Mercedes SL 65 AMG Black Series (Series 22)
Corvette Z06 (C6)
Aston Martin DBS '08 (Series 29)
#2 Audi Sport Quattro S1 (Series 18)
Koenigsegg CCX (Series 29)
Koenigsegg CCXR Edition
GMC Typhoon/Syclone (Series 24)
Lexus IS F
Maserati MC12
Galant VR-4 (Series 17)
Kia Stinger
Chevy Camaro ZL1 '11
DODGE CHARGER SRT8 '12 (PLEASE!!)
Hyundai Genesis Coupe '13
Cadillac Limo (Series 15)
Ferrari F12berlinetta
Toyota Prius
Mercedes SLR (Please!)
BMW E46 M3 GTR Race Car
Ford Taurus SHO '10 (With police customizations)
Ford Focus RS500 '13
VW Touareg R50
Audi Q7 V12 TDI
Rolls-Royce Wraith/Dawn
Porsche 928
+Convertibles like the BMW i8 Roadster, Ferrari 458 Spider, and C6 Corvette GS to just name a few