http://www.youtube.com/watch?v=_eQYZ-aecXw
http://www.youtube.com/watch?v=lojk-...eature=related
It seems in both of these Uther says there must always be a lich king and it seems Bolvar is alive and his soul is still not taken maybe he shall be the noble soul to become the new lich king. Theres the possibility of sylvanas herself aswell, there could also be Varok Saurfang he is also a likely canidate the most noble orc in azeroth i would say. He could take the mantle to avenge the death of his son and keep the scourge from destroying all life.