Seems like Infogrames Germany jumped the gun today with some announcements in their login required press section. According to german magazine PC Games the add on to Bioware's Neverwinter Nights will be called Shadows of Undrentide and is to be released in February 2003 (Germany).
BioWare's Brad Grier (Communications Manager) said that "no expansion plans have been announced for NWN", which leaves room enough for behind the door development speculations. Another post reveals the release date of Unreal 2: The Awakening in Germany: January 23rd, 2003.