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Just wanted to let you know that we'll be performing routine AdSense maintenance on Saturday, May 13th at 10:00 a.m. PDT. During this time, you may not be able to access your account. However, your Google ads will continue to display and stats and earnings will continue to accrue in your account.
Thanks for your patience,
Though there is no new features noticable to us, I would say there is some refinement of the algorthm/ the "knowledge" base that supporting the AS algorthm for ads pricing and distribution.