It's cheap enough that one could still get their money's worth out of this while waiting, though :)

This board only has 1GB RAM and no support for fast secondary storage (only USB2) so having 64bit address space would provide little benefit.

I'm sure there are other advantages to AArch64, like a larger set of registers, that could still make it worthwhile. At the very least it might push down the prices on the old armv7 CPUs.

The native AES encryption instruction set on AArch64 might also be really useful if you do any kind of encryption.