You cannot base these facts on devkits. They are almost always region free, and the sizes mean absolutely nothing (remember how big the original PS2/PS3 devkits were?). Nintendo's handheld devkits in the past have been circuitboards and larger devices that you can't use to gauge the size of the final thing.
So essentially we don't know a lot more other than what ports this thing currently has, and possible layout.
So essentially we don't know a lot more other than what ports this thing currently has, and possible layout.