The Consultative Committee for Time and Frequency (CCTF) is one of the committees from BIPM (Bureau International des Poids et Mesures). They are in charge of time definition and standards.
CCTF has just launched a survey about future redefinition of the second, and future of the UTC and leap seconds.
If you are interested in this topic (UTC is often quite important for Orekit users…), then follow the link and provide your answers to the survey before january 31st. There are several interesting background presentations in the links provided in the survey page.