Hooked ears like that are fairly common and highly desirable in the gaited horse world. I don't know why, unless that maybe it makes them look "keener" or more intelligent, like they've got their ears pricked up all the time. Whatever it is, I like it.
I don't know if Speed's ears will stay like that or if it is just because of how she was laying in the womb. Maybe this is the year for odd ears - Tuffy's have white tips.