GW2: 4 Pillars of Guild Wars 2 Gameplay videos
These are the 4 Pillars, or core parts of the game, shown in video format by ArenaNet. These 4 pillars are; personal story, dynamic events, combat, and PvP.
GW2 Personal Story
GuildWars 2 Dynamic Events
Combat in Guild Wars II
PvP in Guild Wars 2