This is a summary of what's going on during the winter holiday, which runs from Dec. 14 until Jan. 3.
http://www.guildwars2guru.com/news/942-the-winterdays-info-discussion-thread/
Here are more details, including item lists and bug fixes that were done as part of the Winterdays download.
http://www.guildwars2guru.com/news/944-update-notes-for-december-14th/
For all the nitty gritty details, visit the official wiki.
http://wiki.guildwars.com/wiki/Wintersday
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