The ING 'Bankieren' app in the Netherlands has received a small update, now supporting Wallet! It is however not possible yet to add your card to it. But I wouldn't be surprised if this were to happen later today (Friday), or at least next week. But I'm betting on today!
There is an old saying in the IT industry when it concerns installing new software in production: "never go live on Friday". Problems will occur with no one in the weekend to fix them. Especially not in the banking industry.