Could be wrong but I was under the impression that WWDC was no longer going to be a hardware event?
It was not suppose to be a hardware event before. "Developers conference"..... If hardware was ready around the same time then it got release but there is high intent to keep it tightly coupled. Apple moved the iPhone off of it when that was reasonable. When Intel was dropping something new in first week of June for Computex and Apple was more tightly consuming those updates, then yes. Intel often dropping mobile parts into volume in the weeks before WWDC put a number of mac laptop updates into the conference. That was not primarily only due to Apple's actions.
Mac Pro and WWDC being in extended tight coupling is largely a myth perpetrated in these forums. There is no track record for that.
It is likely to be even less a system source now. Intel isn't particular hitting that time window. (AMD has not consistent delivery track record. ). There are also
four operating systems to cover now ( macOS , iOS , tvOS , watchOS ). If each gets 30 mins. that is a 2 hour show right there. There is no time for a product dog-and-pony show. Unless the product is essential to the demo of one of the new OS features, those are best left to other events with their own 1-1.5 hour block of time.
The "sneak peek" would really be far more about stopping the customer flight and "Mac Pro is dead" stories, than shipping product.
If the Mac Pro has been hung up on a blown Vega release and Xeon E5 v4 and Vega are both finally ready in June that could mean WWDC. The Mac Pro 2013 was partially jammed up on release date due to waiting on Thunderbolt v2 controllers. [ the timing that Apple is on hooked to the end of the Xeon E5 tick-tock cycle has caused problems due to nothing to bump the CPU socket with. ]
That being said there are no rules and they can do what they choose, it's just disappointing to be this deep into a hardware cycle without any insight on what they are planning.
if Apple was targeting Aug-Oct for a Mac Pro update it would be likely that something significant would pop up in the macOS beta that was dropped at WWDC. That next version probably would be starting point for any hardware targeting that window for release.
But yeah Apple's "No widespread roadmap, but watch what we actually do" tends to implode when they don't 'do' anything. If they are continuing with Mac Pro they would be extremely better off if planned some limited upgrades/speed-bumps (e.g. GPU bump. CPU bump , etc. ) during their Rip-van-winkle naps.
