I feel like none of the Sierra Forest details are new? As for Crestmont, it still does not appear to feature AVX-512. So, don't get your hopes up.
As for Grand Ridge, it will likely be unobtanium, outside its target market. I'm not aware of a commercially available Snow Ridge board, but there's a chance I'm wrong.
I'm frustrated enough just trying to find Elkhart Lake Atom boards - and that's supposed to be a more mass-market product. Heck even Jasper Lake mini-ITX boards are far less common than their predecessors. It's no trouble finding them in mini-PCs, but you can almost forget about buying a Jasper Lake motherboard.