I've reviewed the WordPress 4.3 release info, and see that it has been downloaded about 3 Mio times now. Is there an expected CiviCRM compatibility date / release for WP 4.3? Thanks for any insights.
Edited 2015 10 02: I've now implemented WP 4.3.0 on an AWS T2 micro instance running Ubuntu 14.04 (Trusty Tahr). It is updated without problems to 4.3.1, and I am running CiviCRM 4.6.8 on it. So far, it is behaving nicely. The site is fully TLS protected, and after patching SMTP.php, I have SendMail linked with AWS SES in operation. Thanks to all who have posted here and on the CiviCRM Forums for helping this effort to succeed.