I was checking my traffic stats using AwStats and noticed a huge drop in unique visitors for almost all of my WordPress sites.

There may be two possibilities in play here:

1) Google ran another update that targeted additional web sites. There have been unconfirmed rumors for some time that they plan to scrutinize WordPress site much more closely. Has anyone seen any info about Google updates during August?

2) The Brute Force attacks on WordPress sites may be subsiding. The unique visitor traffic for some of my sites shot up 4x during the peak of the attack, but now appears to be going back down to normal ranges. The traffic decline started last month.

Brute Force Attack on WordPress Sites

I have not yet seen any info indicating the purpose of the brute force attack, other than to crack the admin password.