First up is a nice new Trailer which unveils a new 'Assassin' class, and shows some awesome footage of characters gliding through the air among other awesome things:
Next up is a long video that shows off the 'Blade Master' and the 'Kung-Fu Master' in solo play:
And finally is a short video that shows group play in a dungeon, and it includes a boss fight at the end:
*Edit: Just added the official G-Star 2010 Blade and Soul Trailer, and another gameplay video that features group play. Thanks to Blade & Soul Dojo for these!