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What I read from that, Stack Overflow owns all the content on the site. Everybody can use any code on SO as long as Stack Overflow is attributed.
This worries me for developing proprietary software, because now the app is not fully owned by my company anymore (and pieces are just licensed off SO). Our legal guys are probably not going to be happy with that.
If I were to ask questions about my open source project, this also implies I now need to put all my OS projects under the same license. I like BSD, and these two are not exactly compatible.
I'd like to see all the questions and answers be placed under the public domain. I feel most people on SO already treat it as such, especially the ones developing proprietary software. I think it's in everybodies interest to also make this very clear on the site.