New York—The future of the popular AllThingsD tech blog at News Corp. is unsure, as featured reviewers Walt Mossberg and Kara Swisher continue contract negotiations with the company. According to a report by Reuters, AllThingsD's contract with News Corp. expires at the end of the year. Possible outcomes include a renewed contract with News Corp. or a sale to another media company. Reuters reported that Condé Nast Publications and Hearst Corp. have expressed interest in buying AllThingsD. The site is owned by News Corp., but Mossberg and Swisher must approve any sale, Reuters reported.