Turbine Entertainment, which decided to reach out to fans in a slightly happier fashion with holiday cards. Seriously. Real ones.
Players on the Lord of the Rings Online forums have reported receiving physical holiday cards from the game's customer service department with hand-written messages and gift cards for 500 Turbine points inside. The community team has stated that this is exactly what it seems to be: a random gesture of kindness and appreciation for the game's playerbase. That message also reminded players to keep their mailing addresses up to date, as this is unlikely to be the only such event.
[Thanks to Fredelas for the tip!]