According to an interview by Kotaku with Dragon Sword director Yosuke Hayashi, it's possible we might see not only another DS title by Team Ninja, but also something from them for the Wii.
"...I do feel that Ninja Gaiden Dragon Sword has been able to move in that direction. Hopefully this title will lead to some examples of how to create some even more exciting action games. So in that sense I would like to work on something in the future for the DS." - Yosuke Hayashi
Cha-ching!
"Wii is also the same way," he said. "I see a huge amount of potential in the hardware and I am personally very into it and pretty excited about what can be possible on the Wii. I'm hoping I can come up with something for the Wii from our team."
Source: http://kotaku.com/373373/team-ninja-thinki...re-ds-wii-games
"...I do feel that Ninja Gaiden Dragon Sword has been able to move in that direction. Hopefully this title will lead to some examples of how to create some even more exciting action games. So in that sense I would like to work on something in the future for the DS." - Yosuke Hayashi
Cha-ching!
"Wii is also the same way," he said. "I see a huge amount of potential in the hardware and I am personally very into it and pretty excited about what can be possible on the Wii. I'm hoping I can come up with something for the Wii from our team."
Source: http://kotaku.com/373373/team-ninja-thinki...re-ds-wii-games