So, we all know that that it's been 10 years since Burning Crusade to Cataclysm, World of WarCraft time. So from WOTLK, to Cataclysm it's been about 5 years. Why is that so important? Let's start off with Wrath of the Lich King loading screen in Cataclysm.
Lore:
Arthas was frozen for 5 years to merge fully with Ner'Zhul. Then he broke out, the current WOTLK loading screen is Arthas sitting on his throne.
So from assuming, it takes 5 years to merge fully with Ner'zhul once putting on the helmet.
The newest Cata loading screen for WoTLK has Bolvar, (current lich king) NOT frozen but looking down at his hands, like if he's just woken up from his 5 year dreaming. Could it be that he might have another story in Cataclysm? Or am i just digging to deep? I think it's possible for Bolvar to have some kind of story in Cataclysm. I mean, after all we can't just LEAVE that entire long ass war behind like it never happened.
I think with the loading screen, Bolvar has finally woken up. He's free now, and he'll be waiting... just like Arthas did.