If any of you hasn't seen it yet, the above video is the Opening Cinematic for Diablo III. But now, what I'm wondering is when exactly the video takes place. I at first of course just thought it was set at the End of Days, but then again, from what we know of the last Act of the third game, the High Heavens has basically been invaded by demons, and the Prophecy essentially says all the various members of the Angiris Council are lost.
Besides, the appearance of Diablo at the end of the video also makes it seem unlikely that the war between the Angels and Demons takes place after the game setting, as the player obviously has to kill Diablo eventually. And what is more, the Book of Cain mentions that Tyrael's physical form was destroyed when he destroyed the Worldstone, and the third game datamining has hinted that he is now trapped in a human form, with little power remaining.
I'm just wondering, is it possible that Leah glimpsed the Sin War battle between the Angels and Demons, when the Angels first found Sanctuary?