Tucson's KVOA News 4 -- one of my competitors -- is launching a 24-news channel on Cox Cable channel 3. (This channel is already running infomercials, by the way.)
According to the Arizona Daily Star they will rebroadcast KVOA's newscasts live and then re-run the most recent newscast over and over until the next newscast.
This is the same thing KTVK does in Phoenix with the Arizona News Channel. It's not always Live, Local or Late Breaking, but it's a good way to get a news channel on the air with minimal start-up costs.
By the way, folks, KOLD News 13 has its own 24-hour weather and news channel: KOLD News 13 Now is on digital channel 13.2 for you HDTV owners. We're also on Cox at digital channel 87, and on Comcast.