Apple hasn't skipped a beat with its annual iPhone and iPad updates, so there's little doubt that it'll be called iOS 9 and launch in tandem with the new iPhone.
But that's months away. iOS 9 is likely to be previewed well before the iPhone 6S unveiling, specifically at this summer's World Wide Developer's Conference.
iOS 9 is due to take center stage at WWDC 2015 with feature announcements and, of course, a beta made available to anyone with an Apple developer account.
Here's what we know so far about iOS 9 and what we're hoping to see in four months.
iOS 9 release date
When is iOS 9 coming out? Well, that depends on who you are. Registered Apple developers presume that they'll be able to test out the iOS 9 beta in early June again.
Everyone else, meanwhile, is expected to have to wait until September to download it. That's when the final version of Apple's latest mobile operating system has come out in years past.
That three-month wait can be a good thing. iOS 9 beta 1 will be buggy and unfinished. The best features typically don't launch until the gold master version in September anyway.
iOS 9 compatibility
This may be the first iPhone and iPad software to require a lightning cable connection, at least if it follows the current trend among Apple smartphones.
iOS 8 muscled out iPhone 4 compatibility last year, and iOS 7 said goodbye to iPhone 3GS two years ago. Is iPhone 4S on the iOS update chopping block?
That makes sense. After all, the company is gearing up for its lightning-port-required Apple CarPlay infotainment system.
On top of that, iPhone 5 and iPhone 5C first introduced 1GB of RAM, up from the 512MB in the iPhone 4S. It's time to retire these 30-pin dock devices.
iOS 9 features we want to see
Home screen widgets
We've been crying out for widgets for years and with iOS 8, Apple is sort of giving us them... sort of.
They live in Notification Center with basic functionality at-a-glance. Pulling down this hidden menu reveals live sport scores, OpenTable reservations and a Calendar preview, for example.
But what we'd still love to see is home screen widgets. Apple has kept its interface clean and that's presumably one of the reasons why widgets have taken so long to arrive in any form.
Empowering users to customise their home screens can only be a good thing, though, and if Apple doesn't want to go as all-out with it as Android has, it could always look to Windows Phone for inspiration and simply make its icons "'live."
This doesn't have to be completely different to what's there now, but folders that tell you more information about changes to the apps held within is our top ask for iOS 9.
Guest and kids mode
Letting a spouse or child borrow your expensive Apple device wouldn't be as much of a problem if there was a proper guest mode and, better yet, kids mode.
Sure, there's a very limited "Guided Access" option that restricts usage to one particular app, but a system-wide guest account for family members would be ideal for the family iPad.
Coupling this proposed guest mode with an instant Touch ID login would be even better and would one-up Google's existing multiple account interface found in Android 5.0 Lollipop.
Let's be honest: using two apps at once is true multitasking. Switching between two paused apps is not true multitasking.
Apple could upgrade iOS 9 from the latter, fulfilling the side-by-side app functionality that always seems to be rumored but never actually pans out every year at WWDC.
A 12-inch iPad Pro would give mobile power users enough space to work with two or more apps at once, and the speculated 2GB of RAM for upcoming devices would back it up.
iOS 8 code had suggested that Apple was testing out some sort of multitasking, so it isn't very farfetched that the feature could make its official debut in iOS 9.
More interface shortcuts
iOS 9 is likely to open up new shortcuts, allowing you to quickly navigate menus on your iPhone and iPad with simple taps or gestures.
Apple did a good job of this with iOS 8 via interactive notifications, frequent contacts listed in the "multitasking" menu, inline audio and video messaging and a bunch of mail app tweaks.
iOS 9 could save us even more time. We'd love to see Command Center host shortcuts to individual settings: holding down the Wi-Fi on/off switch should lead to the Wi-Fi menu, the Bluetooth switch to the Bluetooth menu, etc.
That's much faster than closing the app and heading to the settings menu to make a simple change, like pair a new Bluetooth device. Android has been able to do this trick for years.
Another Google-inspired menu change involves keeping media in the notification menu, not just on the lockscreen. Actively streaming a movie should put the controls at your fingertips.