FWIW, my numbers appear to be stable. But then just a couple days don't mean much as Google stats (for me anyway) can go way up or way down normally just in day to day variation. So they could appear to be stable because they are stable, or maybe I'll be earning a lot less than I have but these days were good days, or maybe I'll earn more than I have but these days were low days. Hard to tell.
The changes Google announced do not necessarily mean that publishers will earn less. It said that the closer the pages match the kinds of content that drives more valuable traffic the advertisers' way, the more you make. The opposite is also true.
So, basically, the same kinds of algorithm changes that can make your site be listed higher or lower in Goolge for certain terms can now also happen to your ad payments. They are specifically trying to lower sites that aren't as good. There'll be some winners and losers.