Current status

Base specifications: all done
You can actually operate IPv6 network and rely on it
Advanced specifications: being worked
Mobile IPv6, QoS, ...

Host/router implementation: everyone is shipping, or will ship very soon
Cisco, Juniper, Exterme, Hitachi, Fujitsu, NEC, ...
Solaris, Linux, NetBSD, FreeBSD, OpenBSD, BSD/OS, WinXP...
Applications: you can do everything you did on IPv4, on IPv6
Advanced applications: getting ready
Monitoring tool, firewall/filters, p2p applications, mobililty...
ISP deployment
Major ISPs are already in service in Japan

You can actually use IPv6 in every day life
(more on this topic from Kato)