considering how Factions really did not relate to GWP that much...
we can only hope...
Anyways back to topic
somethings Cornerstone said earlier caught my attention.
In my opinion the trailer-Shiro does not contradict the Shiro we know from the Cinimatics of GWF. One can argue that the Shiro in the trailer had glowing red eyes, etc... and is obviously not the "human" Shiro that we know ingame.Now this sound like the Shiro that should be, Not the Shiro that was shown in the Cinimatics as to why Shiro turned bad. Does the Shiro in the Official Trailer Look like the one in showen in the Cinimatics?
However the question that none of us can fully answer is how Shiro became "evil" so to speak. So how can we say that the Trailer, or even the Prima Guide is wrong? Perhaps Shiro did practice forbiddon sorcery in the game...after all, how his sceam turned everything to Jade is still questionable.
Maybe things will clear themselves up if Anet play around with the story line. I hope not though...that's like editing your post in the lore forum b/c you realize you were wrong about something. =(Shiro, in the story, just doesnt fit the criteria depicted by every source and its a total contridiction. By the way that thing about the emperor's seer telling him he would be assassinated was somthng i never thought of. But i believe the quotes i gave you fromt he Prima Guide kind of shoots down the thing about shiro turning bad the second he absorbs the emperor's power. Areanet, in a letter they sent me, said that they might change it if they see enough people talking about it.