The listings wasn't up to date 'till tonight (for the last few days), the analitics doesn't seem to work 100%, etc.
Something was or is going on alright.
I havent been watching the serps myself, the mind is elsewhere. However I did see a forum discussion in where someone was having PR changes and someone else mentioning an update roll back. Not really much to go on
Would it be them tinkering with the DC's again to test some anti-spam methods or even a start on de-valuing certain paid links?