I pretty much like this theory. After seeing all of the artworks on the official site, I'm almost 100% sure that the meteor is a falling angel. We are almost certain that the angel is in a cathedral or church. In the cinematic, the meteor is falling near the unknown girl and the cathedral. Finally, take a look at the image in the attachment. The meteor is crashing in a house or something like that (maybe a cathedral???).
I believe it's Imperius... but I can still be wrong.
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I believe it's Imperius... but I can still be wrong.