Woocommerce Custom Tabs with Advanced Custom Fields

functions.php

// This version works with an ACF with the name 'new'
// 1.Displays the tab on every product page
add_filter( 'woocommerce_product_tabs', 'woo_new_tab' );
function woo_new_tab( $tabs ) {	
	// Adds the new tab	
		$tabs['new'] = array(
			'title' 	=> __( 'New', 'woocommerce' ),
			'priority' 	=> 20,
			'callback' 	=> 'woo_new_tab_content'
		);
	return $tabs;
}

function woo_new_tab_content() {
	// The new tab content
	echo $variable = get_field('new');	
}

// 2. This variation allows you to only add the tab to specific product categories
add_filter( 'woocommerce_product_tabs', 'woo_new_tab' );
function woo_new_tab( $tabs ) {	
	if ( is_singular('product') && (has_term( 'your-cat', 'product_cat')) ) {
	// Adds the new tab	
		$tabs['new'] = array(
			'title' 	=> __( 'New', 'woocommerce' ),
			'priority' 	=> 20,
			'callback' 	=> 'woo_new_tab_content'
		);
	}
	return $tabs;
}

function woo_new_tab_content() {
	// The new tab content
	echo $variable = get_field('new');	
}