Let's see. Some other games Ninja Theory developed are: Heavenly Sword, Enslaved, DMC: Devil May Cry. All action heavy games involving lots of combat. So I think it's safe to assume that Hellblade will have gameplay in the same vein. But I could be mistaken, all we have on the game is a CGI trailer.
Worth mentioning is that the game will be released on the PS4 first, then on other platforms.