I was super-exited to hear it too (or rather, I just found out today, and thought, "Wow, I've been out of the loop for a while!"). But I was also a little disappointed. When reading DH, I could see what sort of evidence Dumbledore/Grindelwald shippers would use, of course, but I didn't really see it myself. So it feels a bit strange to me for it to be the one that's validated by her.