The existing Global IPv4 Anycast feature should be replicated for IPv6.
Equinix advertises a block on customers' behalf at most/all sites and carves out individual (or blocks of) addresses from within that advertisement on demand for each customer.
The assigned IPv6 /56 block to each org/project/site can be used to replicate the IPv4 Public IP feature (using local BGP), however there is no dedicated Equinix provided IPv6 block for Global Anycast.
A customer could bring their own IPv6 space, however since the Global IPv4 feature exists now this seems like an easy evolution to IPv6.
Probably goes without saying, but Global IPv6 shouldn't cost $0.15/hr/address though.