no specifics
My impression from this and other threads is:
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the core team works on moving more and more hardware handling into dedicated qubes (increased security through compartmentalization): sys-net, sys-usb, sys-audio, sys-gui, …?
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the distribution used in system qubes is up to the user (to a certain degree, based on what is officially supported and what the skill level of the user is to go beyond that).
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eventually dom0 will have little left to do, at which point dom0 might migrate to a minimal build potentially maintained by the Qubes OS team in it’s entirety
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there is no specific time frame, but a clear process / direction
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given the above, repeated threads proposing various distributions for dom0 are distractions and bring little value: there won’t be any switch in the short-term and long-term the whole discussion becomes irrelevant.