[Jason]

The G90 M5 prototype has dropped some camouflage! Here is the latest G90 specs we know - from the Future BMW Model Information thread:

G90/G99 M5

• Will use S68 in hybrid setup (same as XM) tuned to 718hp. The gas engine contributes up to 577hp and 750Nm, the electric motor goes up to 194hp and 280Nm. The battery has 18.6kWh usable.
• Compared to G60, G90 will be 36mm longer and 70mm wider, with a slightly longer wheelbase due to a different suspension geometry. The curb weight is 2435kg. Standard tires: 285/40/20 front, 295/35/21 rear.
  
• G90 M5 sedan in production 07/24-02/31
  
• G99 M5 Touring SOP 11/24
• 03/27: Interface switch to Panoramic Vision. Passenger screen becomes available as an option.