So I'm fairly certain at some point Savathun will be resurrected as an ally to help fight Xivu Arath and The Witness. The only other Hive unaccounted for are the Lightblade as his ghost escaped at the end of the strike and Taox (not technically Hive as she never took a worm) as she escaped the three Hive gods on several occasions.
Is there any lore or reasonable speculation based to what, if any, for they'll play in the future?
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Taox isn’t even important at this point. Assuming she’s alive (which is pretty much entirely unlikely) there is literally no actual weight or importance to her existence or potential introduction.