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// Change default sidebar text
remove_action( 'genesis_sidebar', 'genesis_do_sidebar' );
add_action( 'genesis_sidebar', 'beatminded_do_default_sidebar' );

/**
 * Echo primary sidebar default content.
 */
function beatminded_do_default_sidebar() {
	if ( ! dynamic_sidebar( 'sidebar' ) ) {
		echo '<div class="widget widget_text"><div class="widget-wrap">';
			echo '<h4 class="widgettitle">';
				_e( 'New Default Widget Title', 'genesis' );
			echo '</h4>';
			echo '<div class="textwidget"><p>';
				printf( __( 'I am going to put some new text here, for the default widget.', 'genesis' ), admin_url( 'widgets.php' ) );
			echo '</p></div>';
		echo '</div></div>';
	}
}