I just found out that both have been posted on a Tuesday which is a crazy coincidence. So I guess I know what day the 3rd one is coming out on.(look out for Tuesday.)
I was looking for a image of pinkie pie when I came across this, and its one good pecie of art. Surprised no one has made a story on this image. (Orginal post: https://derpibooru.org/images/3225544