Here’s what I can tell you. The latest round of Wiis have new drives in them, and these drives prevent current modchips from working. Now, here’s what someone much smarter can tell you.
What they have done is combine the old D1A and drive controller chip in to one which is now called the GC2-D3, as you can see from the photo there is a big blank space on the PCB where the controller chip used to be.
Nintendo throws down the gauntlet once again. Will the mod community be able to create yet another workaround that allows for modchipping?