ICANN has formally announced news that the ICANN Board has ratified the Global Policy Proposal for Post Exhaustion IPv4 Allocation Mechanisms by the IANA.
The policy GPP-IPv4-2011 was sent to the ICANN Board by the Address Supporting Organization (ASO) Address Council on 13 March 2012.
ICANN then posted the proposal for public comment from 14 March 2012 through 4 April 2012, during which time no comments were submitted.
The Global Policy provides a mechanism for Regional Internet Registries to return IPv4 address space to an IANA-managed pool. Once active, address space in this pool can be allocated, in equal shares, to the five RIRs.