Apple were widely expected to be bringing a dark-mode to iOS 10 but did not announce one at the keynote on Monday. They have introduced a dark-mode for tvOS, and macOS has had one (sort of) for a couple of years - but nothing on iOS ... yet. There has been talk of a dark-mode coming in iOS in order to take advantage of the battery-life savings coming in a future OLED-based iPhone display, perhaps next year but I think one may well be introduced sooner. We see that the revamped Clock app in iOS 10 now sports a dark theme, similar to the Watch app. On Monday night I opened up the iBooks app for the first time after upgrading and was surprised to see it was also dark. While the UI elements were the same the usually-white bottom portion was now dark. When I quit and reopened the app, the dark theme was gone, replaced by the usual look of iOS 9. Since that time it has alternated between dark and light with no apparent pattern. Is this a sign of something in the works? Another place I see a potential change coming is in the new Messages app. If you send one of the new rich messages and opt to include the shooting star background, the "theme" becomes dark while the animation is being shown. This includes the keyboard and autocomplete bars, proving that the graphical assets needed to provide a dark-mode in iOS are already there - at least within the Messages app. I don't know if Apple intends to include a dark mode in iOS or ever but these are a few small hints at what *might* be coming.