What make you think they will update 5.0 in October? There is no comfirmation about it, just because DE got it 2 months after they got assist link doesn't mean we will get them in the same amount of time.

It's very clear like Kuebiko said, they are limited the feature to HEAVY spender who RECHARGE with MONEY to get bells, not coupon. After sometimes they will open the feature for casual p2p and f2p who use both coupon/ingot and keep it running for another 1, 2 months or even longer than that before they update 5.0.

Of course this is just my own assumption about their business tactic so it may not mean anything but I know for sure Oasis know how to make money better than most of us here, so you don't have to question their business tactics since you don't have any number in your hand. Just keep play the game, take it slow and enjoy whatever you can.