Sounds like "It's much too easy being lost" to me. This isn't indicative of there being another demo in an obtainable, or even surviving form. It's just Mike having non-finalized vocals in his headphones when he was recording his parts. People don't seem to grasp that songs routinely go through dozens of revisions well beyond the demo stage. If you were to consider this another "demo" you'd badly have to say there are dozens if not hundreds of "demos" of every single song in the Linkin Park catalog. The line has to be drawn somewhere.
I still wish their was meteora demos soon. I can hear him in the vid but I have no idea what he is saying