What about the 64-bit support in iOS? 

"The applications must be written and compiled specifically for iOS and the 64-bit ARM architecture or previous 32-bit one"

This is the only information about 64-bit support found in the main article. But I do really confuse right now about the 64-bit support on iOS. Is it similar with OS X 10.5 running its kernel in 32bit and applications could be in 64bit?