Check this, another self-proclaimed Apple Insider from DarkNet (not DNG), Just says he saw the new mMP and it looks like the Anniversary Macintosh, as a some polished slim-rectangular two-tone metallic tower with dual std PCIe x16 card slot in vertical, stacked side by side in the same plane, Apple Supplied GPUs to include internal TB3 Header, you can disable it and install whatever you want on it, even use the mMP as pedestal for Apple's new 8K 32" CinemaPro Display (non-TB3 but USB-C/DP), and it be named Macintosh again not just Mac Pro, no words on CPU/RAM....
I think with this "Leak" all alternatives have been "leaked" (from DNG's 3GPU Cube, to TrashCan2, CheeseGrater3, and this "30? Annyversary Mac".
Another thing curious is the 2nd "leak" to name it Macintosh Pro instead Mac Pro...