Depending on how things develop, you can very well be seeing the formation of other clans in Dragon Pass. One may be yet another clan leaving Heortland, while others may form if they split from your clan due to the threat of starvation or overpopulation.
One thing you will notice is that they all will share the same background picture. Other than their formation events, they don't seem to have any other special events. More generic sequences (such as declaring a feud, etc.) can be initiated by them, though.