Well, stated intent is great, but it's not the same as certainty. Don't get me wrong - I hope we end up enabling it in 12. But underpromise + overdeliver ;-)
Release notes. To avoid a repeat of the mishap where we enabled parallel query by default in 10, but didn't mention it because it was always kept enabled in master, we've already mentioned it in release-12.sgml.
BTW what's "12 notesnotes"?