In mid-September, although the digital offshoot CBSN may provide replacement programming.
http://www.newsday.com/entertainment/tv/cbs-news-to-drop-up-to-the-minute-in-september-1.10579300
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|_>|_> Brad Beam- Belle WV
To Newsday's reporting, all I have to say is "And So it Goes"
I'm almost certain ABC's World News Now was already up and running in '92.