The latest reports from a reliable BMW insider suggest that the upcoming BMW M5 is poised to break new ground in power and size, albeit with some concerns about its weight.

According to information shared by a member of the Bimmer Post forums known for accurate predictions, the next-generation M5, codenamed G90, will inherit its powertrain from the controversial XM model.

The M5 is expected to feature a plug-in hybrid V8 setup, boasting a combined output of 718 horsepower. This configuration comprises a twin-turbo 4.4-liter gasoline engine delivering 577 horsepower and 750 Nm of torque, complemented by an electric motor generating 194 horsepower and 280 Nm of torque.

However, one alarming detail leaked from these reports is the purported weight of the new M5, coming in at a staggering 2,435 kilograms (5,368 pounds). This figure raises eyebrows as it would make the M5 significantly heavier than its predecessor, the F90 model, by nearly 998 pounds.

The decision to incorporate a plug-in hybrid system rather than relying solely on the V8 engine might be attributed to stricter emissions regulations, especially in the European Union. While a hybrid setup can offer benefits in terms of emissions, the added weight could potentially increase fuel consumption if the battery isn't regularly charged.

Despite concerns over its weight, the M5 is still expected to be lighter than the XM model. Additionally, the M5 is anticipated to be longer and wider than the regular 5 Series Sedan, with an extended wheelbase to accommodate a revised suspension geometry.

The insider also revealed details about the M5's specifications, including the size of its wheels and tires, as well as upcoming updates such as the Panoramic Vision head-up display.

Production of the M5 Sedan is reportedly scheduled to commence in July, with the wagon variant following in November. BMW plans to produce the sedan version until February 2031, with expectations for the world premiere to occur in the coming months. However, initial releases may focus on the sedan, with the wagon arriving later in the year.