It does work with GCU, see my post above, it wasn't showing for me until I went to checkout in the cart, then it'll show up as $48. I'm having a hard time deciding if I want to preorder this game. I don't really want anything to do with the tv show, I just want to play more remedy games.
It worked for you for the DIGITAL version? For me in last stage of checkout it still shows $60+ tax.