According to Jeff Gadway, BBM lovers will soon be getting a new beta to check out and one specific additions has been called out and that is, the ability to use emoticons in BBM broadcast messages on BlackBerry 10. Although I'm not exactly too sure how high it was on the 'wants' list for BBM, it must have been high enough that it caught the attention on of the BBM team and they'll soon be making it available. At this point there's no estimated time given but soon can't really be that far off if it was worth a mention.