In reply to UKC News: The helmet in the vid is the Sirocco, to be released 2013. All the Petzl team had them and they were obscenely light. It certainly seems like the closest you can get to feeling like you don't have a lid on while still being protected.
http://www.petzl.com/en/outdoor/new-2013-products/climbing
For the record, there is no sales pitch for this helmet in the blog. I have mentioned the gear I was kindly given by Lyon because I genuinely thought it was all great stuff, but it was actually the Meteor III that I used.
Why not take a look at the blog? You might actually enjoy reading it and there are a few other stories on there too.....