Comment by dangrossman

Microsoft added the Spotlight feature last year, and this is pretty much exactly what it was billed as: if you don't have a lock screen image of your own, you get random wallpaper images from Bing, and also occasional app offers and tips. You can upvote/downvote the offers to personalize the suggestions in the future. It's an app discovery mechanism, and you can turn it off by picking your own lock screen image. I don't know why it's only in the news now. This isn't the first time wallpapers for an app have been in the rotation.