ARM's 64-bit Juno, An Open Platform Development Board.
Juno development board will only be available to qualified partners & developers and it is aimed for developers porting to 64-bit Android (Upcoming Android L will be supporting 64-bit) & ARM IP License owners. #-Link-Snipped-#
It would be interesting to compare 64-bit ARM & x86_64 both in terms of floating points, integers and performance per watt. You can ask questions about GPU (whether Mali has binary blob or not, or anything else) here : #-Link-Snipped-#
Source : #-Link-Snipped-#