What would make sort-of sense would be:
12" MacBook
13" MacBook Air (similar specs to the current 13" rMBP)
15" MacBook Pro ("Pro" because quad core and discrete GPU option)
...although thats less likely following the launch of the 9.8" iPad Pro
One thing that is for sure - the WWDC keynote script will be locked up tighter than the recipe for Coke and nobody who knows is saying.
Here's the logic:
Battery life has improved a lot since MagSafe was conceived. When you charge at your work desk or overnight, you should be able to route the wire safely. Now the battery lasts all day, those occasions where you had to drape the wire precariously across the floor in the middle of a meeting to get a precious top-up should be a thing of the past. On the other hand, when you are at the desk, you can just attach a single USB-C cable to a dock and hook up your display, backup drive, mouse, printer etc. and recharge - and, without MagSafe, the dock doesn't have to be an Apple one.
...and if you think that a watch or phone that needs re-charging every night without fail is any more use than an inflatable dartboard, how can you disagree?
The actual conference with its developer sessions, no. The CEO's keynote speech at the start of the conference, though, has long been a media circus.
The obvious problem with the WWDC keynote as a product launch, though, is that the conference date is probably set so long in advance, and constrained by so many factors that it's not a good basis for your product development cycle. I'm guessing a major factor in what gets launched is "what's ready?"
