Google News, like a lot of their services is a black box that no one really knows how it works or what criteria they use to pick sites for inclusion.

Generic Google News talking points are:

You need at least 3 or more editors/staff, with some sort of bio page detailing who they are.

You need to push a lot of content through your site. What "a lot" is, no one really knows.

Content needs to meet a certain quality level. What the criteria are for "quality content" is anyone's guess. If you're big enough you won't be held to this as strictly.

Content should offer an independent viewpoint and not be slanted to one side or another. If you're big enough you aren't held as strictly to this.