Could anyone familiar with the project reveal what kind of volumes are we talking about? E.g. nvidia's web page says that the minimum is 100,000 units.
It kinda makes sense not to sell these in small quantities because the SoC manufacturer would either end up getting lots of support requests or they would get a bad reputation for ignoring support. The reason is that unlike in the x86 world where there's some kind of a "standard" (derived from the IBM PC), ARM SoCs don't have any kind of consistent ecosystem where the motherboard components, firmware, etc would be specified. Every ARM SoC boots in a different manner, they might have separate bootloaders and there's a whole lot of SoC specific code in the Linux kernel.
Of course, the SoC manufacturer might be able to release documentation about the chip, but that kind of documentation might not exist (in a neat package that can actually be released and not e.g. an intranet wiki), it might contain sensitive IP (lawyers would have to get involved) or it might be written in a foreign language (and translating technical documentation from Chinese or Korean is not cheap either).
For the industry to mature and move forward, a common standard for SoCs would be a very welcome development.
Disclosure: I work as a SW engineer in a SoC company but I have no connection to the sales department and don't really know how this works in practice.