This has nothing to do with native IPv6. They are putting 1000s of customers behind one single IPv4 address which is a nightmare for everyone involved (think about port forwarding not working anymore, etc.)
What makes you think they'll use just one address and not a pool?
I didn't say they were using just one address. I was saying they are putting 100s or 1000s of customers behind one single address (which is happening in Europe for years already, with UPC for example). Of course they have several IPv4 addresses.