The so-called post type features are flags (boolean values) that mark if a given part/meta box in the admin/edit section will be used or not. The default features are 'title', 'editor', 'comments', 'revisions', 'trackbacks', 'author', 'excerpt', 'page-attributes', 'thumbnail' and 'custom-fields'.
Post type features
$_wp_post_type_features
By the Web Warlock, Wednesday, 28/Jul/2010 1:16
The global variable $_wp_post_type_features stores the features enabled for the different post types as a boolean value of the index $_wp_post_type_features[post_type][feature].