Samsung has a 64 bit Snapdragon in the works, based on the ARM-v8A (410?).
Two considerations:
1) Android will probably be compiled for 32 bit for quite a while, since a 64 bit compilation won't run on a 32 bit processor, and that would mean keeping 2 versions available (which costs money, which is what this is all about).
2) Apps not compiled for 64 bit operation won't run any faster. (And since most "developers" don't know 64 bit from 6502, and for the reason in #1, you won't see many 64 bit apps.)
About the only change we're likely to see as consumers in the near future is phones with more than 3GB of RAM. And almost no one has a 3GB bottleneck, so it's like better paving on a road but keeping the speed limit the same. IF things were different, you'd get a speed improvement, but since they aren't, you won't.
By the time everything has converted over to 64 bit ... that tablet will seem ancient to you, if you can find it up in the garage attic, where you tossed all the other old electrical stuff. Futureproof with lots of RAM (meaning 3GB) and lots of storage (at least 32GB internal, maybe more)? Yes. Spend extra money on a 64 bit SoC? I wouldn't.
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