The World Wakes

The World Wakes is a Grandmaster quest scheduled to be released in February 2013, first mentioned in the Lore Livestream and later in the Behind The Scenes.

Details
As revealed by Jagex in the Behind the Scenes Video #40- Community Management Team, this will be the most important quest players will ever get to play. The concept art below shows what could be the entrance to the first resting place of Guthix.

Reward
Rewards include over 800k in XP, new combat abilities for all points of the triangle, a magical ring, new cosmetic torso gear, and access to a brand new Slayer area with targets that drop shiny level 85 gloves and a pet.

Additional rewards
Only the Combat level of 140 is needed to start and finish the quest, however for additional rewards you will need all of the following:

Trivia
It has been hinted that the first of the two new skills will be hinted towards during the quest.