I think BA will continue to market themselves along the same lines as before (ie positioning Club as the superior biz class product to premium paying passengers & push the competitive prices to the price sensitive leisure passengers).
To many (ie not the jaded few at FT), 'that music' evokes romantic thoughts of travel, exotic locations, relaxing, returning home from the unknown etc. Therefore I'd be very surprised if it goes!
BBH have clearly demonstrated that they understand BA's needs better that M&C, hence the change....but I think the shift in marketing will be a slow evolution.
But hey, what do I know?! It will probably be a complete overhaul & that's why I'm not employed by an ad agency! It does also look like Willie wanted to make a big statement early on about who's boss & that Lord King & Maurice Saatchi being pals is no longer relevant