New lich model isn't even close to terrifying, come to think of it, it actually looks kinda cute!
That Frost Wyrm isn't Sindragosa, her head is completely different. http://www.wowwiki.com/SindragosaYeah, in the generic model they used for a quest, it looks like. Sometimes models get updated to look like they were truely supposed to for a raid instance, you know? That may be why in the rendered cut scene in the beginning of the game, Sindragosa, the frost wyrm in it, has proper horns like this model you see here.
I was reading MMO champion bit of a spoiler but the lich model is for a female boss.