alt Hacker NewsThat's a ways out. We're not even using all bits in addresses yet. Unless they want hardware pointer tagging a la CHERI there's not going to be a need to increase address sizes, but that doesn't expose the extra bits to the user.
Data registers could be bigger. There's no reason `sizeof int` has to equal `sizeof intptr_t`, many older architectures had separate address & data register sizes. SIMD registers are already a case of that in x86_64.
You can do a lot of pointer tagging in 64 bit pointers. Do we have CPUs with true 64 bit pointers yet? Looks like the Zen 4 is up to 57 bits. IIRC the original x86_64 CPUs were 48 bit addressing and the first Intel CPUs to dabble with larger pointers were actually only 40 bit addressing.