The new Raw image processing features introduced into Adobe Photoshop Lightroom 4 are truly wonderful. Raw files, previously processed in earlier version of the plugin, reveal new details and qualities. (See Lightroom 4 / Adobe Camera Raw 7 / Photoshop CS6)
Tom Hogarty of Adobe Lightroom has written a small piece in his Lightroom Journal on the technological background for the new (PV2012) processing method. Warning: It’s definitely technical!