This might explain the situation a bit more, same source as FDJ's post by the look of it.
"Owners of UHF CB radios now have access to more channels in the 400 MHz band, following a comprehensive three-year ACMA review, and subsequent release of its timeframes and plans to restructure the band.
Despite some incorrect media reports that users will have less radiofrequency spectrum as a result of the changes to the band, the ACMA’s extensive consultation process means the UHF CB band has been restructured into 80 individual 12.5 kHz-wide channels. This is changed from the existing 40 individual 25 kHz-wide channels.
This restructure means the following changes to channelling arrangements in the UHF citizen band:
•the UHF Citizen Band Radio Service will be extended upwards by 6.25 kHz to accommodate an additional 12.5 kHz channel
•all voice channels will transition to 12.5 kHz bandwidth
•existing repeater channels will transition to 12.5 kHz bandwidth, with new repeater channels created in the space between the existing channels.
There is a planned phase-in period for the new arrangements. Retailers will be able to supply 25 kHz equipment for approximately 18 months to clear existing stock, while radio owners will be able to keep using their current 25 kHz radios for six years.
The previous technical standard, which specified the technical performance limits and test methods for 25 kHz equipment, has been revised to accommodate the new channel arrangements. Standard AS/NZS 4365:2011 was published in January 2011.
On 26 May 2011 the revised standard was incorporated into the ACMA’s equipment regulations, and the Radiocommunications (Citizen Band Radio Stations) Class Licence 2002 was updated to reflect the new channel arrangements.
The consultation process on the changes to the class licence closed on 4 March 2011.
The ACMA has no plans to return to a system of individual CB operating licences, as claimed in some reports.
Further information on the changes to UHF CB is available on the ACMA website"