L (Android 5) apparently will support 64-bitness. Presumably 64-bit phones to take advantage of it are coming soon. Unless one really must get a phone in the next month or so, it makes sense to wait to see what hardware is coming.

I expect lots of people who have bought phones in the last 6 months to have buyers' remorse pretty soon...

Cheers,
Scott.
("It's better - it's 32 more!!11")