Check the announcement on the front of the Wii Shop Channel. It mentions something about being able to view more statistics in nationwide results or something.
I tried my USB keyboard and it still only works when composing a message, not all over the Wii Menu.

Similarly, the new Internet Channel only lets you type addresses and into forms, but there's no way to navigate the pages, aside from scrolling with arrows. Heck, you can't even press "Enter" to submit the URL you just typed--you have to go back to the Wii Remote.
It's a step though, and I'm sure forum-goers will appreciate it.