That is not confirmed yet. Like I said in my post, the games will most likely be similar to Wii Sports and Wii Play. They won't be anything major, because the Wii only has 512 MB of storage, and even and SD card only has a few gig. Maybe if the majority of people have 10 gig SD cards ( exist ? ), then this might be the case. But since the games will be quite big ( 9 gig on dual layer ? ), it would not seem very likely that we will see full games.
Think of it more like Xbox Live Arcade, I would guess.