It's most likely going to be like with ARM and be embedded only, sadly. There's a large number of us, not large enough though, that want a standard ATX motherboard, with PCI-Express and an ARM, RISC-V or PowerPC processor (well an affordable PowerPC).
!! The Raptor workstation was just barely outside my budget; if I hadn't just upgraded my actual workstation I probably could have talked myself into it.
Assuming it's priced comparably cheaper to the raptor, I am buying a blackbird as soon as it comes out.
MACCHIATObin is a mini-ITX ARMv8 board with PCIe and great firmware (comes with U-Boot but you can flash (or chainload from u-boot) EDK2/TianoCore with ACPI support (!) and even QEMU for the "GPU BIOS" thingy that lets you get video out as EFI framebuffer)
Also there's the SoftIron Overdrive 1000 (sold only as full system, not bare board)