Hi Tatumanu, I'm also trying to find information about the update as well. I've seen two people claim it changed to come out on the 26th. I'm not sure how true it is, however, I am hoping more information will come soon. I feel as if Nintendo and everyone online forgot about the update because...
although i ended up accidentally changing my nand with no way of going back bc i didn't know you needed a gamecube controller to restore it (i have a wii minus/1.1, which doesn't have gamecube controller support)
and if i find the sd card i have my NAND backed up on, i can not only restore the NAND if i solder the right part in, but i can also put my NAND on dolphin, then i can play dolphin online, like PMEX Remix or MKWii Riibalanced