Your computer being IPv6 compatible is incidental to the actual transition to IPv6. IPv4 to IPv6 NAT will be used as the circuit that's provided has IPv6 only

Your computer being IPv6 compatible is incidental to the actual transition to IPv6. IPv4 to IPv6 NAT will be used as the circuit that's provided has IPv6 only connectivity in order to support older clients. And then, in order to talk to any hosts that don't have IPv6 support (a large number of them, as in, insanely large number), you'll need an IPv6 to IPv4 bridge (provided by the ISP, transparent to the end user). If done properly, hosts that support IPv6 will start getting traffic as the onsite CPEs and gateways start getting IPv6 addresses rolled out to them (likely to be starting on date X new customers get IPv6 IPs and existing customers maintain IPv4 for the transition period).