VGX trailer was december 2013. So right at the time of the intial rele of XBox One and PS4. And the SoD trailer was E3 2014. Just sayin...
VGX was clearly as in-game footage marked and the Comnunity Manager Marcin Momot stated once that the scenes out of the SoD were reproducable ingame.
The footage shown at VGX was propably already 1 or 2 years in development.. so my point still stands.. they showed what they had at that point before adapting to the new renderer(SOD Trailer) and the consoles (lack of)power.