iFixit revealed that the HDX differs from the recently relaunched kindle Fire HD. Rather than have a rear shell with everything mounted on the back of the screen, the backside of the Kindle Fire HDX is the case. Everything from the battery to the circuit board, speakers, heatsink, and camera are mounted in the rear shell. Even the screen snaps into place.
They also noted that this tablet would not be easy to repair (unlike the new KFHD). The battery was glued in place, and replacing that would require that you first remove the circuit board. And getting that in and out is no minor operation. And finally the LCD is fused to the front glass, so you'll need to replace both components in the event of a cracked screen.
I was a little surprised to read about all the differences between this tablet and the new Kindle DX. They have a similar looking shell and come from the same company, so I had assumed they would share a number of basic design details. They don't, and that might be a sign that Amazon is willing to change everything about their tablets with each new model.
If that is true then there's a chance that Amazon will surprise us with each new tablet. I don't know about you but I'm looking forward to it.