Besides DS games, Nintendo has also announced a list of upcoming Wii titles for Japan, the US and Europe. As with the DS games, most likely this is not a complete list, so do not read it as such.
Japan
Wii Fit Plus 2009/10/1
Sin and Punishment 2(Temp.) 2009/10/29
Mario & Sonic at the Olympic Winter Games™* 2009/11/5
New Super Mario Bros. Wii 2009/12/3
NHK Kohaku Quiz Gassen 2009/12/17
Cosmic Walker(Temp.) 2009
Kensakusu(Temp.) 2009
Span Smasher(Temp.) 2009
Dynamic Zan(Temp.) 2009
100 Go de Start! Eikaiwa(Temp.) 2009
Hoshi no Kirby(Temp.) 2009
Line Attack Heroes(Temp.) 2009
Monado: Beginning of The World(Temp.) TBA
METROID: Other M(Temp.) TBA
Super Mario Galaxy 2(Temp.) TBA
The United States
Wii Fit Plus 2009/10/4
New Super Mario Bros. Wii 2009/11/15
Sin and Punishment 2(Temp.) CY2010 1st Quarter
Endless Ocean 2(Temp.) CY2010 1st Quarter
METROID: Other M 2010
Super Mario Galaxy 2(Temp.) 2010
Span Smasher(Temp.) TBA
Line Attack Heroes(Temp.) TBA
Monado: Beginning of The World(Temp.) TBA
Europe
Wii Fit Plus 2009/10/30
New Super Mario Bros. Wii 2009/11/20
Endless Ocean 2(Temp.) 2010
Sin and Punishment 2(Temp.) 2010
Spring Super Mario Galaxy 2(Temp.) 2010
METROID: Other M(Temp.) 2010
Nintendo notes that titles are release dates are subject to change.