The newest Wi-Fi protocol, 802.11r, which has become the de facto "Wireless VoIP standard", is now a published standard of the Institute of Electrical and Electronics Engineers (IEEE) standards board.
802.11r has been in the works since 2004, with the express purpose of developing a Wi-Fi connection that can quickly pass between access points. A go-ahead for publishing the final draft of the standard was given by the 802.11r task group last January.