The new IPv6 code that seems to mostly be merged into master is running in production now (on a large cluster) and it seems to be fine as far as I can tell. The only thing I needed was one final merge from topic/robin/v6-addr-merge because there are a few changes there that are very much needed.
I just wanted to point out that the code is in live testing now and should be ready to wider testing for those interested once the next merge from Robin's branch happens.
.Seth