I don't have a problem with this, but I came here wondering if Cortana had received some sort of update. I have not changed any of my preferences in the settings, but over the weekend, I started seeing things in Cortana that I've never seen before: the aforementioned "trending stories," a section titled "Here's what's happening in [current city location]," and evea movie trailers that it thought I might be interested in.
When I tried to search for updates including these features in Cortana, it appears that all of these features were released sometime last year. I have been using Cortana since about 2 weeks after it was first launched on the PfD last year, but I find it strange that this weekend is the first time I'm seeing these features if they have previously been available. For the record, I'm currently using an AT&T branded Lumia 830 with the latest official Windows 8.1 build that AT&T has released.