I am wondering if this opens up the possibility of having more than two WhatsApp Number on the same phone. Especially on iOS.

I have long requested this feature for Whatsapp Business, where I can pay an annual subscription just to have more than one number. So I can separate life between Business and Friends.

I think you can do it on pure Androids that can have more than 1 SIM card, you need to have an Android profile for each and have both sim cards in the same phone.