The Secret World.
Called The Secret World: Massive Edition, the bundle contains the core buy-to-play game, all of the issues to date, and this Halloween's Plague Doctor outfit (seen in the picture above). While Issues #1-4 were previously free with the core game, Issues #5-7 were sold as DLC.
The promotional edition is on sale at half-off for $29.99. The game, its issues, and the Plague Doctor outfit can also be purchased separately.
Funcom also announced that it will extend the game's current Halloween festivities through November 11th.