Yea, apps aren't really like channels, like other people said. For news just read it online and find the website of the news channel I like. Its more up to the minute anyway. Roku has all kinds of apps for different channels - CBS, ABC, NBC, Fox, PBS etc all have their own app. Some are free, some are not. Whether or not you need a cable subscription to log in to the app really depends on the cable company in your area. You can search the channel list online for news and see what comes up. Premium cable channels like Starz, Showtime and HBO have their own apps or add-on services for an extra fee. But then you can get all the shows.
I like my Roku because I can easily access all my video apps. SyFy, Hulu, Amazon, Netflix, PBS, etc all have Roku apps. I do have a tv subscription for a few things that aren't yet streaming. Once the last few companies catch up to the 21st century, I'll get rid of it and get SlingTv or something.