A few days ago Googleguy said something like "Don't worry, there will be PR changes in Australia, but it's nothing important, just engineers at work...". He also said summer was a good time for engineers to monkey with things.
So my first guess, since I see nothing in the US, is that what you are seeing is just the engineers at work. Even tho you are not in AU.
I'd be happy to see a pr update, tho, since it would mean google had decided to update more often.
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