Posted January 05, 2013
That is a good question, I was just going by what valve posted on their new page earlier on: "Gamers will have a final opportunity to get their favorite games on Steam. A select number of the most sought-after titles from the Steam Holiday Sale will reprise their biggest discounts for two additional days. The Encore Weekend begins at 10am PST on January 5th (Saturday) and run until 10am PST on January 7th (Monday).
P1na: But won't all "standard" discounts disappear by tomorrow? The retribution page states the 50% offer will only last 12 more hours.
Check out the Steam homepage for more information!"