I wouldn't take the cinematic trailer very seriously as a literal representation of gameplay. From the gameplay trailer I think the classes will determine the styles. Knights will always be heavy 2-handers, Samurai will always have a Katana and
Vikings will always have whatever they have. And I don't think the Vikings will have a shield. Why? It would probably betray their concept. I'm hoping this game will feature a hardcore mode without the HUD assists for parry directions, so we have to actually read the stances, as opposed to read the HUD white "arrows". And without the HUD I think the shield would make the stances too hard to read. Also consider that the stances work both for defense AND offense. How on earth would a shield indicate left while the same guy would have to indicate left with his sword, too?
So... my guess is that
shields will be only for extras, so you can 1-shot them anyway.
I like shields... I also like spears, but I aplaud them in their design.Consistency is important. What they have is already very sophisticated. It's fine if they need to leave some classic elements out of gameplay. And it's specially fine if these elements are still represented aesthetically, such as shields and spears for the extras... and thrusting in some finishing moves.