Sarah Blocksidgethis is actually insane. my coworkers and I have placed bets to when they'll announce an update (I chose tomorrow)
other dates picked: March 13 (Friday the 13th), March 17 (St. Patrick's Day, and March 20 (my 2nd guess, as mercury retrograde ends)
Simon Cox 
@sarahblocksidge
What if this is the new norm? Constant change.
Looking further back - this from Wincher - there has not been this level of volatility for at least 3 years.
@simoncox Totally possible too! I know ads and AIOs have gotten more aggressive in pushing down organic results, and I do see some AIOs changing weekly. A constant case of chaos from Google wouldn't surprise me one bit