IPv6, IPSEC and deep packet inspection

Since IPSEC is an integral part of IPv6 won't this have an affect on the
deep packet inspection firewalls? Is this type of inspection expected to
work in IPv6?

Well it will work as good as the Virus-Scanning on Firewalls,
when you use a SSL website.

Perhaps using some kind of NAP the firewall is allowed to speak on behalf
of the host(s) it firewalls, so that to the client it appears to be the
firewall itself appears to be the IPSEC endpoint?

If the IPSEC implementation allows that it
is seriously broken. You are proposing the firewall to run a man
in the middle attack.