Also everyone on Unitymedia. Dual stack if you're a lucky older customer, DS lite (CPE has routable IPv6 and NATed IPv4) if you are new or get something changed.
I just noticed that a few weeks ago, with no change in contract. I have a resold Telekom VDSL line, and I was quite pleased to find that I now have a native IPv6 connection with a /56 assigned.
I'd tried some IPv6 settings in my router last year, and 6to4 worked pretty well at that point.