The Steam Holiday Sale, originally running from December 20 to January 5has been extended to January 7. The last day of Steam sales, a date of sales reprisals, has been tweaked into "The Encore Weekend", meaning that the most popular sales during the Holiday Sale will be reprised.
It's possible that Valve may be extending the sales for reasons outside of holiday spirit, however. Keeping in mind that this is pure speculation on the author's part, the Holiday Sale may not have generated the desired numbers that Valve's achieved in the past years. This year, Amazon, GamersGate, Green Man Gaming, along with other digital download outlets, hosted similar end-of-the-year sales that outmatched Steam's in terms of time and discount percentage. The old jokes about Steam sales performing atrocities to a PC gamer's wallet just didn't ring quite as true this year. Have Steam sales finally met their match?