These are the changes to the shopping channel:
- The main page of the shopping channel now offers recommended games
- There are several announcement messages and the Wii points item at the bottom of the screen
- You can now filter by publisher, system, genre to help with selecting which Virtual Console game you want. Also you can do a free text search and check out the most popular downloads (presumably from the current week - not all time!)
There are also a few changes here to the main Wii menu such as the addition of a ugly LCD style clock and news/weather channels show details within the icon to save you clicking into them.
There's a few other bits and pieces as detailed on Vooks. Why not check it out?