Originally rumored to be an M770i model to present the 7-Series, it appears that the M Performance variant of the 7-Series will be an M750i. A possible powerplant lurking under the hood of the luxury sedan is a BMW 4.4-liter, twin-turbo V8 with around 450-hp, with xDrive as an option.
Undoubtedly as an M Performance model, the M770i will also feature suspension and aerodynamic changes, and should be priced in between the current 750i model and the 760Li flagship.
But what would be a real surprise is the introduction of an entry-level 728i with a four-cylinder engine. In a way though, it also makes sense as the German automaker could use a lower-end 7-Series model with better fuel efficiency to help average out its fleet. The 728i is rumored to feature BMW’s 2.0-liter, four-cylinder with 245-hp, but could be joined by a small electric motor, essentially making it a hybrid.
[Source: BMW Blog]