As mentioned earlier by Paul, KVBC will not be broadcasting in Hi Def, just Standard Def. Those same signals will be delivered to COX for retransmission on their system on channel 733. This is listed as a Hi Def channel and is capable of the bandwidth needed for HD resolution but only transmits what is given to COX by the station - In this case, a Standard Def signal. Those with OTA should be able to find the digital feeds currently out there and see that not everything that is digital is Hi Def.
The FCC mandates that stations have to go DIGITAL, but doesn't say they have to go Hi Def. When KVBC has more material available, they may begin transmitting those signals so that local viewers can see the programming, but the expense of the equipment is still quite high.
Currently the SA3100HD is the only box available in Las Vegas for decoding 256QAM HD signals, but the output is locked at 1080i. Consider that CBS transmits SD signals most of the time outside of the primetime lineup and I think that we will see a comparative signal with KVBC when they go live, just no HD lineup. At least they are not going the route of ABC with 720P. It just looks like they just zoom on the picture to achieve an acceptable resolution for retransmitting. Although it is 720P, which natively should be good, most of it was "upconverted" from SD, then downconverted back down to 1080i.
I just mentioned that the SA3100HD box was the only box available for now. As with other markets, Vegas will be letting the customer buy their own box in the future, just like the cable modems. Current customers should be grandfathered in with the lease (and option to buy). The industry is leaning towards the electronics retailer (Best Buy, Circuit City, etc.) to make bulk national purchases from the manufacturer to provide savings to the customers. Current SA3100HD box prices to COX are actually about the same as for individual customers - at about the $500 mark. Hopefully a national sales purchase and competition will drive down prices and we will all win in the long run.
But I digress... This could turn into its own thread.