Overall they are looking to change the id generation away from guaranteed sequential to time based but remain 64bit unsigned int. From the post: "...Instead IDs

Overall they are looking to change the id generation away from guaranteed sequential to time based but remain 64bit unsigned int. From the post: "...Instead IDs will be derived based on time: the most significant bits being sourced from a timestamp and the least significant bits will be effectively random." The main concern on the thread is the since_id and also the max_id used mainly for pagination and caching.