From the official site of The Witcher:
"We would like to apologize everyone, who impatiently awaited today's release of the D'jinni adventure editor and the first official adventure 'The Price of Neutrality'. Unfortunately, due to unforeseen circumstances (legal issues concerning making and publishing of mods), the release of the adventure editor has to be delayed until the last week of March. We are sorry again and we thank for understanding. We will also make all possible efforts in order to avoid any other delays and to provide new additions, that will meet your expectations.
Correction: Unfortunately, the release date of D'jinni + new adventure has been changed from the next week to the last week of March."