In an apparently unrelated post, bushing has affirmed that the bootmii is in late because they have strange problems on the SD cards.

They don't know why, with some SD cards it works, and with some other SD cards it does not work...

As i stated before, Bootmii is a program that will be loaded before the system menu.

You will be able to load the homebrew channel directly, or perform "risky operations" without fear of ruining your wii