IPv6 is tomorrows internetwork protocol -- perennially, it seems. BIND has supported IPv6 forward and reverse-mapping since Version 4.9.5, released way back in 1996. BIND 9, finally, added support for IPv6 as a transport, responding to queries received over IPv6.
The IETF -- the body that develops extensions to DNS, among other things -- briefly flirted with a very complex method of handling IPv6 forward and reverse-mapping, using A6 and DNAME records and "bitstring labels." (Unfortunately, I wrote the fourth edition of DNS and BIND at just the wrong time and documented A6 and the rest.) Eventually, however, they opted to standardize on a system that uses AAAA and PTR records in a straightforward way, similar to the way A and PTR records work with IPv4 addresses.
Getting Started
Zone Data
BIND Name Server Configuration
Electronic Mail
BIND Name Server Operations
Delegation and Registration
Security
Interoperability and Upgrading
Resolvers and Programming
Logging and Troubleshooting
IPv6