Audi has the S8, Mercedes has the S63 AMG and Jaguar has the XJR, but BMW has always held that an M7 wasn't justified, leaving its associated Alpina line to tackle that market with the B7 (pictured).
Forget about an M7: this is the new B7 from Alpina ... such as a full-color Head-Up Display, a rear view camera, the latest BMW navigation and communication and infotainment systems.