With the introduction of the Wii, Nintendo went from being nearly forgotten in the console market (excluding handhelds) to being a superstar. The Wii has sold amazingly well and continues to do so, approaching Microsoft very rapidly for number sold. With that success they have a lot of momentum to introduce new titles, and that is exactly what they intend to do.
At this year's E3, they expanded on what they will be doing in the near future. During a press conference, Nintendo announced various things such as the release of Smash Bros. Brawl later this year and even a physical fitness game designed to help players stay in shape.
Most interesting, however, was their statements surrounding WiiWare:
The WiiWare game development technology will officially begin service next year, according to Nintendo. The Nintendo press release promotes WiiWare as a service which "provides game creators a simple method by which they can get their games to the public."
Depending on how they handle it, they might get a plethora of developers working to craft games for their console. Doing such would be a benefit to Nintendo as well as players, since getting past the licensing fees has been a bone of contention for many game developers for a long time.
Many other games and products were announced, such as the re-introduction of the Zapper for the Wii, the light gun that the NES is remembered often for.