Obsidian Entertainment was responsible for both Neverwinter Nights 2 and Knights of the Old Republic 2. The founders of Obsidian came from Interplay's defunct Black Isle Studios, which was responsible for Fallout 2, Planescape: Torment and the Icewind Dale series.
Interestingly, some of the other folks working on Fallout 2 went on to form Troika, which was responsible for the Arcanum, Temple of Elemental Evil, and Bloodline games. One of them (Jason Anderson) ended up back at Interplay working on an MMORPG (possibly the Fallout MMORPG, for which Interplay still holds the license, and for which they are being sued by Bethesda for supposedly violating the license terms). Anderson left Interplay to join inXile, which is Brian Fargo's company -- original founder of Interplay -- and they've expressed an interest in doing a new Wasteland game.
Wasteland, BTW, was the original inspiration for Fallout.
Methinks the CRPG industry is a small world, after all.