Previewed at WWDC, launching in the fall.
First iOS 8 Banner Appears at Moscone Ahead of WWDC
Apple's iOS 8 is expected to retain the same general look as iOS 7, offering polish along with several new features including a health-aggregating "Healthbook" app, new TextEdit and Preview apps, and possible improvements to both Siri and Maps.
We will get our first glimpse of iOS 8 on Monday during Apple's WWDC keynote, which kicks off at 10 AM Pacific Time. Apple will be live streaming the event and MacRumors will also provide a live blog, live tweets via the MacRumorsLive Twitter account, and a spoiler free page for those who want to watch the full keynote at a later time.
Update 11:38 AM PT: MacStories has provided another image of the banner, which can be seen below: