Candidate characters for Unicode are not yet finalized—so some may be removed from the candidate list, and others may be added. Names, images, and code points may also change, so these candidates are not yet ready for use in production systems. Other prospective emoji characters are still being assessed and could be approved as candidates in the future.
Proposals for new emoji characters can be submitted at Submitting Emoji Character Proposals, which also explains the selection factors used to assess new emoji proposals, the process, and the timeline.
Show your support of Unicode, and adopt a character!