Its been well documented that the coverage for some channels (especially in America) are spotty. As well as Nintendos online service in general.
The only channels that seems to have regular updates and focus are the Wii Shop Channel and the Mario Kart Channel (which strangely has yet to miss a single update yet that I can see). All the other channels have either had downtime, missed updates or even have been pulled for western release, such as the internet channel (though its still available for download in Japan).
When it comes to the Nintendo Channel itself, it originally seemed like a good idea for browsing new content. But it quickly had limitations, such as most games outside of Nintendo published games didn't have previews or even info on the database. And their intuitive 'search by interest' feature mostly didn't work. Frankly, the whole system seems more like a dumbed down version of gametrailers.com running through the Wii interface. A nice idea, but VERY limited. I wouldn't be surprised if the people running it are a bit lazy and don't even update the content with all the information, thinking most people only search the database for certain content (such as WiiFit or WiiWare titles).
Six upcoming games you should look into:
