Looks like B&H Photo has it available for special order: AMD Radeon Pro VII Graphics Card 100-506163 B&H Photo Video
AMD is not selling it yet.
Thanks, in the announcement they said the date for selling was mid-June...
There's no support for it in the current Enterprise drivers, so it's not on the market yet. I don't know if AMD decided to delay it to take advantage of HBM2e or if Covid-19 slaughtered the demand for it', but it's possible it won't make an appearance until August, which is the next Radeon Pro Enterprise driver date.
I don't know, but it should be supported with ROCm already.
AMD Shop's page for Radeon Pro VII now lists 4 e-tailers.
Shop > Graphics Cards > Radeon Pro Graphics Cards and Accelerators > [x] Radeon Pro > [x] Radeon Pro VII
The Radeon Pro VII was announced in May, so it has been six months. Maybe there was a 6-month exclusive period for OEM systems.