In Canada an E55 Touring is a rare sight, but i did see a black one today

As for the RS6 Avant, i've never seen one IRL.

Regarding the M5 Touring i'm actually pretty excited. While the exterior still does little for me i'm excited at the possiblity of having M power with extra space..

Not long ago CAR magazine did a Saloon vs Touring test, the vehicles included the 3 series, the X Type and the C-class. From that test they found the BMW to be the only Touring wagon which actually offered increase space over it's saloon counter type.