There's another PoV to look at this, without speculating. If by September there is no announcement, then you can more seriously think of moving away from Mac Pro altogether, regardless of when/if it will be finally launched.
Having a workstation machine left out in the cold for over 3 years, without upgrades, and without any announcements of where it is going, are enough reasons to call it a day. It is ok - I guess - to surprise-launch an iMac or a laptop. But workstation owners need to know the strategy behind their investment, they need to have a clear view of the machine's lifecycle. Even if a new Mac Pro is launched tomorrow morning, Apple has already failed on that part.
Having a workstation machine left out in the cold for over 3 years, without upgrades, and without any announcements of where it is going, are enough reasons to call it a day. It is ok - I guess - to surprise-launch an iMac or a laptop. But workstation owners need to know the strategy behind their investment, they need to have a clear view of the machine's lifecycle. Even if a new Mac Pro is launched tomorrow morning, Apple has already failed on that part.