This is not a correct sentence. You would not write this sentence. The normal sentence ends with "9:00", and then the announcer says "next" as a single-word comment. As someone points out above, that "next" means "the news (which I just mentioned) is next". And "next" means "after the current show, on this channel".
TV advertisements use anything that works: they aren't required to follow English grammar. And this entire 4-sentence annoucement was an advertisement, trying to convince viewers to stay on this channel when the current program ends, so that they can hear "more details" about the news event. This kind of announcement (pre-announcing some details) is called a "teaser".