Mike O'Brien takes to the stage for the Heart Of Thorns presentation to finally reveal details on the expansion pack. 

While Mike was providing an overview of the Living World model, viewers were shown some of the feedback ArenaNet had received on Episode 8 from Guild Wars 2 fans.

Viewers and attendees were shown some incredible concept art. It's great to see Daniel Dociu and his team still churning out stunning work. 

A piece of Revenant concept art depicting Rytlock Brimstone.

In this still you can see the new Earth Keep under attack from siege equipment.

Another still of the Earth Keep from above. 

Classes will have access to weapon sets in Heart Of Thorns. Here a Mesmer wields a Sword and Shield - they were previously unable to use a Shield. 

The Engineer also receives a new weapon set, the Hammer. Alongside this you can also see he has a new skill - flying robots that follow him!

Stronghold is a new PvP game mode. An evolution of Guild versus Guild system, players fight for Supply before spending it to hire troops where they'll assault the enemy Stronghold to kill the opposition. 

Colin confirmed that as part of the expansion pack, players would travel to the Heart Of Maguuma.

More concept art of Heart Of Maguuma. 

ArenaNet revealed Guild Wars 2's latest Heavy Armor class. The Revenant wields the power of The Mists to call forth Legend's from Guild Wars' past. Rytlock is the first Revenant in Tyria. 

There will be a new World versus World Borderland. Each Keep on the map has its own elemental theme. Holding objectives around the Keep will provide bonuses to the World that holds it, providing a key incentive for players.

Players will be able to Specialise their class into what is effectively a secondary profession. The Ranger is able to turn into a Druid with a whole new set of skills. 

Heart Of Thorns will contain some of the most challenging group content ever delivered in Guild Wars 2.

New class skills will be a big part of Guild Wars 2. Here is a screen capture of a new skill from the Mesmer, a timed area of effect explosive blast.