Oracle hasn’t announced any such plans. That doesn’t seem likely at this time at all. That could be years, if ever.
https://forums.virtualbox.org/viewtopic.php?t=98742
https://www.virtualbox.org/ticket/20192
Potential build speed up coming to mind for developer builds:
…but probably miss out on platform specific packages:
Existing Ports of and Porting Whonix to other Architectures
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