Mark Gurman, who is known for landing Apple scoops, is reporting at 9 to 5 Mac that iOS 9 is going to be light on new features and heavy on bug fixes.
There's been a lot written about iOS 8 and Yosemite and how they seem to be just above (or below, depending on who you ask) the acceptability line. I've written before that I consider the iOS 8 / Yosemite releases to be a special case. The community at large, myself included, wanted for so long for our Macs and iOS devices to talk better amongst themselves. Also, how many home screen posts have I put up here where the subject concluded that if they were in charge at Apple, they'd make it easier for iPhone and iPad apps to share information.
Apple delivered on these requests with iOS 8 but making changes this substantial necessarily came with a lot of bugs. I don't have any of Mark Gurman's sources but I'm willing to agree publicly right now that iOS 9 will at least feel like the upgrade Mark explains in the above quote. This is true if, for no other reason, because I can't think of any update to iOS that would be nearly as ambitious in scope as iOS 8 was.