The Gala Winterfest Extravaganza is "a pleasantly vague and non-threatening holiday event" put on by the Protostar Corporation. It involves an artificial winter makeover of the landscape and plenty of shopping. Seriously, shopping is mentioned like 16 times.
Carbine's developers also posted a new holiday card for its fans in addition to the following promise: "We can't wait to introduce you to the Dominion, reveal the other classes, and get you guys into beta next year! Have a Happy New Year from everyone at Carbine!"