So I figured with the release of the full length intro cinematic, that there would be some theories and perhaps some moderate discussion what it implies and simply I wanted to create a topic where you could do it.
There are however most probably people who have yet to view it, so therefore the minor spoilers (because come on, watch it damn you) tag in the title. The aka is mostly that I mused on the thought that people would probably think that you could tell the release date by counting the freckles(?) on Cains very bald and shiny head.
But enough of that and on to what I have gathered from the trailer so far:
We are shit out of luck. Goodnight.
No but seriously, the trailer hints at a massive battle between light and dark but I think that they will do battle on Sanctuary rather than in heaven or hell. Why? Because either side would probably be empowered by their respective home and therefore they would need a neutral ground to fight on, which means that we get the stinky end of the stick.
Moving on in the trailer, I did find something that is very interesting with the meteor / comet (?) and it's a shape or something similar that lies in it (think World Invasion: Battle LA style) and descends into Hell. Which I also find interesting because I thought very early on "Why the fuck would a minion or even Diablo descend from the heavens?!" This led me to thinking that it's either Tyrael or Inarius / minor angel who has no name and it's a full on first attack on Hell.
But why THAT Cathedral? Ok, here I have two theories:
First - It's where it all started, only fitting that it should end ( or continue) from the place it all began, or perhaps there is something particularly special about that place that makes it an important and strategic point of attack.
Second - This is building on from the strategic / important PoA, because you can clearly see the meteor / comet splitting off in in at least one other direction which could be another PoA.
These are just my thoughts after a careful scanning of the cinematic, will post what I find later on but don't limit it to just the intro cinematic, discuss EVERYTHING about Diablo 3 that you might find or have a theory on.