All IPv4 address space was allocated to regional authorities by March, 2011, and exhaustion of these allocations looms. When exhaustion occurs, there will be no room left for further expansion of the Internet, and/or increasingly problematic uses of NAT, with application failures increasing with time. IPv6 has existed for a long time, but has not been widely deployed in home routers, and since usage has been low, networks may have latent problems that need to be fixed to enable a seamless transition to IPv6. Recent experience with IPv6, especially since World IPv6 Launch in June 2012, have shown that IPv6 transition is feasible, desirable, and growing.
CeroWrt has IPv6 networking enabled by default. If the router receives and IPv6 prefix by DHCP prefix delegation on startup, all your local networks will be automatically supplied with a usable IPv6 address range.
Even if your provider does not support IPv6 natively, it is straightforward to configure CeroWrt to give global IPv6 addresses using 6to4 or 6in4 networking. The wiki gives instructions for configuring a free 6in4 tunnel through Hurricane Electric.
IPv6 can be easily disabled or modified via the router's networking screen, on the 'v6' option, but please try to report bugs and expend the effort needed to actually use it. The future of the Internet is at stake!