WiiConnect24 is the hardware feature that will allow it to stay connected while youre catching Zs, but online will play a big role both in games and as a new experience on Wii. Because it introduces new gameplay technical functions that has to do with online, and some games are online only. There is even one games in the works that requires to be connected, but still is a single player game... You can never imagine what you can use real-time information to.
The Opera web browser has already been confirmed for the Wii, but I can reveal to you that it will not be sold on a disc. It will be integrated in the software, and even in the hardware. It's all tailored to work together. And Opera is not only a way to browse the web and chat, it's also for games. Because that's the only thing we at Nintendo care for. Games. Because it's a games console. That's important to always remember. Whatever we do, it's to improve the game experience.
So, Opera will be fully integrated into the system, and it will connect to a special Wii portal from Nintendo. It's not yet finalized, but it will be there, as the most amazing online service the world has seen. Since much of this is still in the works, I dont know if Opera will come at launch. Maybe it will come as an update later on, but that you can still grab from online with the basic WiiConnect features built in the hardware, or you can go to a games store and download it with Wi-Fi.