I highly suspect there won't be user accessible RAM, just doesn't fit the way Apple is going. They will just offer higher limits. If it is up-gradable, I think it might be through some kind of add-on card or something, only available and install-able from Apple so it works with the T2 chip.
PCI-E cards, kind of must for the high end work stations, so this just has to be there if there is going to be a Mac Pro with Apple silicon. Question is, who's going to make cards for them? I can see there being very few available, maybe some for direct video importing and such. Doubt there will be any GPU options to be honest, AMD has bigger fish to fry than making a few custom firmware GPU's for a tiny number of machines.
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