BMW NA said that they will no longer offer Touring (Wagon) models in the US. None. The F31 is the last one, ever.
However, if they did decide to bring over a 5 series wagon, it would only be available in the lowest spec engine possible - similar to the F31 only being offered in the 2 liter 4 cylinder - and only xdrive - and only automatic.
If you want a super sporty German wagon in the US, Mercedes-Benz is your only option from now on.
