Well I have the Professional Stereo system in my 120d (the same as is in the coupe here) and it has a Logic 7 logo on the Surround Sound settings screen. It also has 10 speakers, including 2 in-floor subwoofers and a graphic equaliser.
It may be that 'Logic 7' is a certification standard for HK and may require a 'central' speaker (as exists in the larger cars).... I don't know. The logo is there despite the words 'Logic 7' not appearing on any brochure or spec sheet...
What I DO know is that is sounds terrific, which is all that matters
Cheers,
Paul