To mark the start of the Return to Vana'diel campaign, Square Enix has announced seven simultaneous in-game campaigns for those adventurers starting again. From December 11th through January 14th, experience points will be doubled, seals for battlefield orbs will drop at increased rates, Salvage plans, Skirmish simulacrum drop rates, and Monstrosity experience will also be doubled, a series of special Abyssea related benefits will be bestowed, and a number of battlefields will see additional items available from the treasure pools upon completion.

Looking forward to this event? Let us know about it over on the ZAM forums!

From Playonline.com:

We have conjured up a whopping seven campaigns for adventurers returning home to Vana'diel so that thet can delve into the action, whether alone, with old friends, or with new comrades they meet along the way!

Event Period

Wednesday, December 11, 2013, at 12:00 a.m. (PST) to Tuesday, January 14, 2014, at the same hour.

Event Details

1.) Double experience event
The amount of experience earned by adventurers and their fellows will be doubled!
* This experience gain adjustment will not apply to Abyssea areas.
* This bonus will stack with the effects of Dedication.
* Experience earned by clearing content and using specific items will not be affected.

2.) Increased seal drop rate event
The drop rate for all seals, included the sacred kindred's crests added in the November version update, will be increased based on the number of adventurers in your party-up to a maximum of six!

3.) Double Salvage plan drop rate event
The rate at which plans for Salvage II drop will be doubled!

4.) Abyssea event
During this event, a blue treasure chest will appear near Horst in Port Jeuno (H-8). Opening it will confer the benefits listed below. Furthermore, players journeying to Abyssea during the event will have their default values for pearlescent, azure, golden, and silvery lights set to 100.
- Eleven types of atma
- One piece of lunar abyssite
- 100,000 cruor
* Those who have received these rewards previously will be unable to do so again.

5.) Double Skirmish simulacra segment drop rate event
The rate at which Skirmish simulacra segments drop from colonization and lair reives will be doubled!

6.) Double Monstrosity experience event
Experience earned by monipulators will be doubled!
* Monipulators are unable to receive the effects of Dedication. Be advised that possessing a monster while under the effects of Dedication will remove those effects.

7.) Seals battlefield event?additional items dropped
During the event, vanquishing specific monsters in the following battlefields will reward you with a variety of items, including materials needed to create +2 empyrean equipment, Mog Bonanza kupons, Dynamis currency, synthesis materials, and more!