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<?php
add_action( 'woocommerce_single_product_summary' , 'woocommerce_brand_summary', 25 );

/**
 * woocommerce_brand_summary
 *
 * @access      public
 * @since       1.0 
 * @return      void
*/
function woocommerce_brand_summary() {
	
	global $post;
	
	$brands = wp_get_post_terms( $post->ID, 'product_brand', array("fields" => "all") );

	foreach( $brands as $brand ) {
		echo __( 'Brand Description', '') . ': ' . term_description( $brand->term_id, 'product_brand' );
	}
	
}