All the themes and plugins have been tested against WordPress 4.3, PHP 5.6 and MySQL 5.6. Readme files have been updated accordingly. You should see a slew of updates available in your WordPress Dashboard as a result.
With WordPress 4.3, the core team has dropped support for PHP4 constructor formats. If you turned on debugging on your site, you’d see a warning message that the PHP4 format has been deprecated. Some of the Semiologic widgets were still using this old way. No more. All are now using PHP5 constructor conventions for calling WP_Widgets.
Speaking of PHP5, PHP 5.6 will now be the recommended minimum PHP version starting in WordPress 4.4. Everything was tested against 5.6 with no problems at all.
I even went back and updated the Semiologic Legacy (original) theme to fix the widgets.
Throughout the years Semiologic has been stable and has worked from WordPress version to the next. The design and coding has held up extremely well and these changes have all been trivial software tweaks for Semiologic.