I honestly don't know why the leather/leatherette combos and colors are so tied to certain packages. I was told by a dealer that for 2014, BMW's X1 options are supposed to open up and not be so restricted to lines.
As an example, I personally prefer an all-beige interior over the oyser/black contrast, but the sport package I wanted does not offer ANY light interior, beige, oyster or otherwise. So I was forced to get the x-line, which looks great, but then I am stuck with the chrome kidney grills which, on a black car, are not my favorite, so I may ask the dealer to replace them with the black sport-line kidney grills. All this is probably TMI but exemplifies the problems with these restrictive lines which BMW will hopefully modify for the 2014 model.
Congrats on your car - mine comes in a month.