Yep, it’s already available to download.

After finishing with the firmware update, there will be a new update for the Internet and Everybody vote channel in the Wii Ware section on Wii Shopping Channel.
You have to update your everybody vote channel, otherwise it won’t work.

This update brings Wii closer to one stop multimedia system available for TV. Using USB keyboard we can now type our email instead of picking the buttons using the wii index finger.

This is the list known to date the new features which comes with the new update:

• Full compatibility support for USB keyboard
• Links received on the Wii message board now open in Internet Channel
• Can send links to friends
• Can copy text from the page being viewed and paste it into a search

(source)