See my new work blog post. Excerpt:
No longer is IPv6 "just around the corner". It's here. In the half-year following when I last wrote about our measurements of IPv6 adoption, many of the metrics we were tracking have doubled. This is in large part due to increased adoption of IPv6 by residential broadband networks in the U.S.A. and Germany. As of December 2013, we were serving over 20 billion IPv6 requests per day, double the 10 billion per day delivered just six months prior.