NORMALLY, I try to tune out the marketing mumbo-jumbo dished out to the press at new-car introductions. That’s typically quite easy, since hearing about “prioritized messaging points” and “bi-modal buyer distribution” is boring whether the subject is an economy car or a Ferrari 430 Scuderia. But in the case of the new 2009 Cube, I think Nissan’s marketing strategy for its boxy creation says a lot