Apologies for the delay.
TalkTalk is committed to transitioning to IPv6. To minimise any potential impact to our customers and services, the transition will be phased over the next few years as we roll-out new products and services such as fibre to the premises.
We continue to work closely with our network and systems vendors to ensure all new equipment is fully IPv6 compliant. In fact, our network already operates as dual stack, using IPV4 compliant addresses while the major network components are IPV6 ready.
Yeah (I got a canonical response via one of their resellers)
Talktalk have no plans whatsoever to offer it in the next 12 months (at least - more likely 2-3 years - the actual response I got was "ever").
If you were promised it as part of signing up then take it up with your local trading standards. If you're being strung along, take it up with Trading Standards
Ofcom and the ASA WILL NOT pursue lack of IPv6 as "not full internet" or misleading advertising claims and the various "consumer advocacy" sites such as thinkbroadband are not interested in taking up the cause, claiming it's too much effort.