I have read that the Newsflash segments originally did not have opening logos, and when the opening logos were created they were attached to future airings of most of the early newsflash segments that didn't have this logo, with some exceptions, and some Newsflash segments (like the Don Music ones) never had an opening logo included.
I wonder if the writers were just experimenting with having Kermit as a reporter in the first year of these sketches. Many people think that the Tortose and the Hare skit was the first newsflash (or, more appropiately, Sesame Street Sports). There, he was a sportscaster instead of a news reporter. And I think that was the only Sesame Street sports sketch. And there are two other skits that I know of which didn't have opening logos that seem a bit different from the usual Sesame Street News format, and looking at the pictueres at Muppet Wiki, they feature Kermit wearing his dark brown hat. These skits are the weather report, where Simon Soundman gave a weather report, and a skit where Kermit asks a real girl what sounds animals make. I would assume that those skits are from the first year of the newsflash.