Well, after debating whether or not to update since i spent 2 hours downgrading back to 3.2 a while ago, i finally decided to update since i really want this feature. So, i made a video showing what it does. Along with the new SD Card Menu, you can also download games from the Wii Shop Channel directly to an SD Card.
I was mostly just trying to compare load times between NES, SNES, N64, and WiiWare Games and then see how they played. It works really well i was impressed.
Here is the list of changes (From Nintendo.com/wii/menuupdate)
* Store more—Add more Wii storage using SD Cards or the high capacity SDHC Card format (up to 32GB)
* Improved SD Card support—launch WiiWare™ titles, Virtual Console™ games, or channels directly from an SD/SDHC Card
* Let your Wii console move games and channels to an SD/SDHC Card with Auto Manage when system memory fills up