Should be coming soon. Fairfax VA was going to get it Oct 2015 but it was delayed. Hopefully that is for the better and they are taking their time getting it right since their HQ is in VA.
Once it is active, you will want to set your WAN's IPv6 to Native and stateless. Make sure you have a DOCSIS 3.0 modem, NOT a gateway. You may have to reboot the modem and the router and should pull a WAN - 2600:8807: /128 and LAN - 2600:8807: /64. When running 25000M and 25015M above: Administration>Management page, enable IPv6 and radvd. See here for more info dd-WRT. Also see here for a bunch of useful info on Cox IPv6 in general.
Finally I would suggest using a second IPv6 DNS since I have heard reports of Cox's DNS delaying IPv6's AAAA requests.
The Google Public DNS IPv6 addresses are as follows:
- 2001:4860:4860::8888
- 2001:4860:4860::8844
See here for more info Google DNS.