The same basic MAYO except that this version makes it responsive along with the settings needed to set layout for Big screen, Small screen touch, and Tablet devices.
This version also reverts back to the old style search input form.
Increased support for Superfish menus as they are much improved for responsive designs.
Uses SASS but not a problem when using a sub-theme.
HTML5 used but didn't go as far as it could have with semantic markup. It's a good start.
Code cleanup;
More theme settings;
Better SASS files structure;
Less templates for startrkit theme;
An additional ctools panel style;
And as usual bug fixes