Apple is similarly paranoid about single-sourcing -- off the top of my head I'm not sure whether their top-end M-class chips are currently fabbed by both TSMC and Samsung, or just TSMC>
As of this moment, the only company that is definitely going ahead with that next generation node is TSMC. The other two companies capable of doing so are both signalling that they will only do it if they get a partner who promises to use them for significant volume, not just as negotiating leverage against TSMC.