Selected answers from the Dumb SEO Questions G+ community.
Clayton Nichols: You're going to see even more as Mobile begins to dominate the search. ;
Rob Wagner: ;warned us a week ago that this was coming. Nice call Alistair.
Alistair Lattimore: Google have been making changes since the last week of August but it wasn't clear with the ebbs & flows of our traffic what was happening until a fortnight ago.<br /><br />Now that more data is in, its clear what is happening and Danny Sullivan has confirmed with Google in a SEL article that they are indeed rolling this out more broadly. ;<br /><br />If the current rate of growth we're seeing in our data holds, we should see close to 100% in ~4-5 weeks.<br /><br />Ouch.
Slawomir Zdunek: In my account I see over 90% of not provided keywords. The good thing is that we can still see search queries in Google Webmaster Tools as well as in AdWords accounts. I think a number of people can turn back on GA unless Google introduces paid version where you can have access to keywords data. (That's a pretty good idea, I guess :)
Operation Technology: I'd gladly pay a bit for the keyword data that led to clicks. And the lolz goes to >> Cutts was quick to respond that it was estimated that the amount of "(not provided)" visits "even at full roll-out ... would still be in the single-digit percentages of all Google searchers on Google.com."