Developers can now get started building 64-bit apps.  The new x86 64-bit Android L developer preview emulator image is now available.  This will give developers greater access to increased addressable memory space, a larger number of registers and new instruction sets.  While there has been some conjecture about what features may or may not make the cut, this will at least give developers the ability to get started.  It will be interesting to see what this will add to the Android ecosystem as Android L comes to fruition.

Source Google via Talk Android

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