Bundled now as the Betrayal at Krondor Pack, the update adds the spiritual successor to Kondor at no additional charge, along with Kondor's normal set of bonuses. Although not a direct sequel to Kondor, Betrayal in Antara--which launched in 1997--uses an updated version of the Kondor engine.
This week's release continues the recent surge of high-quality content updates at Good Old Games since its controversial relaunch on September 23. While Antara isn't as revered as Planescape: Torment, it's a welcome addition. And at the price of "free" for current Kondor owners, how can anyone complain?