What if Apple goes for a separate Mac oriented presentation after the March event in say April or May?
The question is, how much stage time the other rumored introductions would need/get:
- New Apple watch bands: couple of minutes.
- iPad Air 3: 15 minutes.
- iOS9.3: another 10 minutes.
- iPhone 5se: yet another 10 minutes.
In total maybe one hour for iOS-related things. So even with some fillers (music acts etc.) there should be sufficient room for extensive Mac coverage. Assuming that it will be a "typical" 2 hour event.
Of course, without a redesign (just a CPU/GPU-drop-in update, as someone mentioned) we might also just get a press release for the Macs and another boring keynote with topics being stretched endlessly with empty babbling to get to the 2 hours. I'd guess they would be able to dedicate nearly 10 minutes to that Nightshift (edit: just when I was about to click the "Reply" button, "Nightshift" from the Commodores is playing on the radio
😎) feature only, if they are really running out of topics. Scary thought ...
Since pretty much the entire Mac line needs updating, it would be viable to hold a dedicated event. And that leaves WWDC open to talk about software (e.g. new iOS, OSX etc).
Over the last years Apple have become infamous for having a _very_ thick thin when it comes to updates to their Mac line of products. Mac mini and Mac Pro immediately come to mind. And hardware introductions at WWDC are far from being uncommon iirc.
If we don't see new Macs in March, this could hint at only two possibilities: Either they lost their focus with all that iOS hype - or their focus is laser-sharp, just unfortunately not on the Macs, but on things like an AppleCar or Apple-VirtualReality.
To borrow from Arthur C. Clarke: Both options would be equally alarming.