Approximately 20,000+ cards, reading between the lines of what is said in their videos. I could be wrong though. They don't want to tell because they don't want to give their competitors information.

I already received my card, I use it almost everyday. Works like a charm, i never had any issues with app or card.

It is a temporary card even though I live in the EU. They told me that I will receive another card for free when the new worldwide issuer is starting deliveries.

I'm guessing there will be 100k+ cards at that point. Their competitors will have a lot of ground to cover when they are ready.

The first dividend payment will come after the Metropolis update of Ethereum. It will be almost a 6-month payment, after that it should be paid monthly. It is not paid by adding an additional fee, but by part of the standard credit card fee the seller has to pay. Most buyers don't know this, the price stays the same to them.
But yes, 0.5% from every sale.