Well you can look forward to a little less weight in the new shelby with no spare tire. It says in the pre order pdf that you get a can of fix a flat repair kit instead.
Actually, that's not too bad. Most of the high performance cars now don't have a spare and come with run-flat tires, which arn't the best for performance. Since they are going the fix-a-flat can route they can save money on tires not having to buy expensive run flats (and pass the savings on to you) and get better performing tires.