Most desirable wagon available

Perhaps the rarest BMW around, the 5 Series Touring comes in only one flavour: with a 300-hp twin-turbocharged 3.0-litre inline six, six-speed automatic transmission and xDrive all-wheel drive. Rapid load-lugger that will see Rover looking for a five-point harness. Inside, the Touring is starting to date like all 5 Series, and will see a revamp next year.
Most desirable wagon available
Why no 535d Touring over here?