In addition to the various other minor changes in wording, the new version is much more specific about things like heights, intervals of time, number and sexes of dwarves in the caves, Forest vegetation (most notably lilacs instead of plain bushes when the young dragon first appears), and Daystar's bodily struggles at the cave-in and final wizard fight by the brazier. It redefines a few bits of geography (of the Forest, the cave-in, the location of the Mountains of Morning) as well.