The Alpina B6 based on the 2012 6-series (F13) prototype has been spotted for the first time, on the streets of Germany.
Typical to form, this B6 prototype can be identified by its Alpina wheels, quad exhaust, and lack of M style aero parts (meaning it's not an M6 prototype). This prototype does not yet feature the eventual Alpina bodywork.
Expect the F13 B6 to feature the same powerplant as the F10 B5 (based on the current F10 550i sedan) - a 4.4L twin-turbo V8 good for 507hp, but perhaps with slightly upgraded power output.
Source:
Carscoop
And here are some renders by forum member Harold Wood and Philip of what the Alpina F13 B6 could resemble
