Android L official launch is near. The Android developer community has just released an Android L Emulator image specifically for Intel's x86 64-bit architecture.
It will allow developers to build or optimize older apps for the upcoming Android L OS and its new 64-bit architecture to access more RAM to boost their Apps. Moving to 64-bit increases the addressable memory space, allows a larger number of registers and new instructions sets for developers.
Apps built on Java will automatically gain the benefits of 64-bit but those built on the Android NDK will need some optimization to include the x86_64 build target.