Ninja Theory [Heavenly Sword, Enslaved: Odyssey to the West] revealed Hellblade during Sony’s Gamescom press conference earlier this month, with the debut of the game’s teaser trailer. It was an unexpected surprise, and now the devs at Ninja Theory have released development diary to discuss how they’ve created that trailer.
Devlopment Diary 1: The Announcement — 6’01”
You can also see a version of the trailer from very early in its development, with some of the blocked out environment and selected shots from the mo-cap shoot
Hellblade Teaser Blackout — 1’34”
Hellblade is currently in development for the PlayStation 4 as a timed exclusive. It is planned for a 2015 release.