iOS has always been about intuitiveness, but every once in a while, it assumes a little too much. That seems to be the case with the Panorama photo feature, which, at first glance, appears to only allow panoramas to be shot from left to right. If you were under this impression, it's totally understandable, but there is indeed a way to reverse it!
Simply tap the large, white arrow on the panorama slider to reverse it direction. The arrow will flip to the right side of the screen and you can now record your panorama from right to left. Ta-da!