Here is the new spectrum allocation for the 700MHz band. The one you may be reading about in the news, being bid on by Google and others for an estimated 15 billion dollars. Google is interested in the 'C' band and is willing to pay 4.2 billion dollars.
The digital switch narrows the spectrum needs of broadcast TV. All the stations that now use channel 2 through channel 69 for analog signals will broadcast their digital signals in the spectrum space now used by channel 2 through channel 51. Most stations will keep their original station number. The switch over from analog to digital happen in 2009.
This blog post shows the older frequency spectrum. This web page show the new DTV Channels and their frequency bands.
Remember TV stations had to switch to digital transmissions, but are not obligated to transmit in High Definition. They can use their entire band to transmit in High Definition or just transmit in normal digital and run two or three different programs at the same time.
Relating topics;
High Definition Television Technologies, just a few terms.
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