Thanks to everyone for voting and commenting on this suggestion. Your input in the comments helps us understand how this affects you and what you're hoping to accomplish with Bitbucket Server.
This suggestion is a priority for the Bitbucket development team and is on our roadmap, however we're not able to provide a timeline for when it will be resolved. We have an implementation of emoji support that needs further refinement before it is production-ready. Learn more about our process here.
Product Manager - Bitbucket Server