Yes, 6er has been a great success for BMW AG.
Initially the car was meant to be a new 8er (mind Z9 GT concept): based on 7er platform. But the marketing dept. found out there was much more perspective market for the 2dr GT in a segment below 8er.
Therefore they opted for 6er revival - based on 5er platform, positioned between 5er & 7er. And they succeed.
Although the design was too futuristic for its time, lately the design is much more accepted, adored & appreciated.
After pushing 7er (E65/66)even more into luxury territory, and launching the RR cars by BMW Group, BMW AG started to fill the gap between BMW & RR brand. Bentley was missing badly. Aston Martin was eyed, but it either wasn't for sale, or the price was too high. Therefore BMW AG decided to make 2 moves to fill the gap: launch a "baby" Rolls (to compete with Arnage - price wise), and to offer a new "8er" - this time as super-luxury sporty 4dr GT: positioned well above 7er (competing with Bentley Continental family). As well as Z8 coupe-roadster positioned between 7er & GT.
Since F10 5er is going even more sportier, so will go the 6er as well. New 6er will be a tad more sportier yet still retaining the GT personality. It will be closer to eg. Jaguar, Aston, Maserati.
While the 4dr GT ("new 8er") will be the new BMW brand flagship, a step towards RR brand.
5er ... PAS, X5 ... X6 ... 6er ... 7er SWB ... 7er LWB, Z8 ... "new 8er GT" ... baby Rolls: RR Silver ghost family: sedan ... coupe ... cabrio) ... RR Phantom family (sedan ... coupe ... cabrio)
