I searched and didn't see a thread about this, to me it's a big deal, it's late coming but a big deal neverless...
http://wii.ign.com/articles/101/1013118p1.html
"Here's where things get really good for Wii owners. As I mentioned High-Capacity SD is now supported, with 32 gig cards already on the market and pretty cheap considering the amount of space you're getting. A quick search on google got me a 32 gig SD card for around $60, and if you need to go cheaper than that you can find 16's for half the price. The reason you'll want a new SD card is pretty simple; SD streaming will kick off with GH5. All the tricks used for both Guitar Hero and Rock Band in the past – leaving internal memory open– is gone. Instead, straight-up booting off the SD card is available, and that means easier downloads, larger expansions, and quicker loads when bringing in song data from the SD card into GH5."
-Mark Bozon
The Interweb is about overreaction, this is what makes it great!
...Imagine how boring the interweb would be if everyone thought logically?