Development for the 13 mini will likely have started way before the 12 mini was launched and sales numbers where available. Besides that they will share a lot o

Development for the 13 mini will likely have started way before the 12 mini was launched and sales numbers where available. Besides that they will share a lot of components, which makes development cheaper. Bad sales of a 12 mini will be more likely to affect whether a 14 or 15 mini will be released.