No, that's not live, it was on a sandbox. You can't get into Icecrown at the moment, if you try, you just get ported back where your HS is set.
They've added the Storm peaks now though, and I know from my own exploring that if you can survive a long fall then you can probably get over the invisible barriers that stop you getting in. I haven't tried though, I'm focusing on the Death knight.
And as for Sylvanas, her model was updated:
http://img53.imageshack.us/img53/43/...2858nf9.th.jpg
