Guild Wars celebrates its 4th Anniversary on April 28th, with the usual celebrations taking place in-game from 23-29th April. However, it's the new content due to be released during this time that we're most interested in. All characters will be given access to an extea bag slot, and it will be possible to purchase extra Xunlai Storage slots at a cost of $9.99 per pane. The "Zaishen Menagerie" will also be opened, which adds additional pet functionality to the game. It will also be possible to purchase access to all the "common" pets in-game, for $9.99. Finally, daily "Zaishen Challenge" quests will be introduced, which will see characters tasked with completing a mix of PvE and PvP objectives.

Full details on the update can be found on the official Guild Wars website.