Virtually all operating systems support IPv6. It's the networking CPE that will need replacing.
That said, I checked my print servers and cameras.
The Axis cameras may be able to get a new NIC for IPv6 but not the rest of the equipment.

I'm not sure how a dual stack architecture will work. Only high end routers currently offer it. I looked at a Linksys WRT610N, but the specs still say it is an N draft 2.0 version and nothing about dual stack compatibility for the router side. The manual does show how to set up DHCP for IPv6 on the private side.

I think it would be great to set up a private IPv6 and IPv4 network (dual stack) lab just to see how well it works.