From another forum, but relevent to most hunters, If you have been thinking about updating and purchasing a NEW UHF CB, you may want to wait 18 months, as in 2011 we will see the UHF CB Band change from the current 40 UHF CB Channels to 78 UHF CB Channels.
In short, they are changing the 'step' between the channels from 25kHz to 12.5kHz so they fit twice as many channels in the same bandwidth.
There will be 16 repeater channels including the retention of the existing ch5 emergency repeater.
Ch 23 and 24 will be retained as telemetry/telecommand channels that can not be transmitted on by CB users (these channels have been phased out and not available on many UHF radios made over the past 5 years already)
By 2016 the 40 channel UHF radios we use today will be obsolete, to an extent - they will continue to work, but will not be able to access the new repeater (duplex) or simplex channels available. By 2016 only 78ch UHF radios will be available to purchase (new).
The new radios will utilise the existing antennas and will likely not look any different to the radios we use today.