I also had an amazing day yesterday. My page RPM nearly doubled and my total earnings for the day beat my previous best day by 20%.
Just like HuskyPup, it seems to be driven by high CTR (and I've made no layout changes on my site in the past few weeks). Either they are finding more compelling advertisers for me or they changed how ads display somehow. Did the mobile style arrows next to text ads roll out for the first full day yesterday?