In my area, TWC's network is AS20001. According to »
bgp.he.net/AS20001, its IPv6 prefixes are 2600:5c00::/32 and 2605:e000::/32. So I'd expect my IPv6 assignment to be in those subnets (unless of course they are assigned more before they do the roll-out).
But still no sign of it here (LA), using an Apple Airport Extreme. I would expect it to be quite a few months before they finish rolling it out over their entire footprint.