There is new information on the German Nintendo website and besides email confirmation they at least confirm it for Q4.
http://www.nintendo.de/NOE/de_DE/games/wii/disaster_day_of_crisis_9381.html
- play as former US marine Raymond Bryce
- the player drives, swims, runs and shoots in 23 different parts
- natural disasters include vulcanos, earth quakes, flooding, thornados and tsunamis.
- additionally, you have to fight against the terroristic group "SURGE"
- use Wii Remote+NunChuk for escaping those natural disaster, deactivating bombs and more
- you always have to keep an eye on Ray's health, he needs clean/fresh air when his lungs are filled with smoke and he also needs food for getting energy
- save civilians from dangers, e.g. drowning or do first aid
It is also said that it's got a story that could have also made it for a movie.