Is the aftermath of that pretty much going to be scrapped with Cataclysm?

We won't be able to do The Battle For The Undercity anymore, will we?

Has anyone tried that on beta?

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Q u o t e:
Last build it was bugged, when you get to the cinematic it doesn't play and there is no quest to continue further. I think they might've disabled it temporarily to fix any issues but can't be 100% sure, haven't tried since the latest maintenance (and to be honest, I'd rather not risk getting stuck in an alternate phase).

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It's not bugged. The quest ends at the cinematic now.