Are there going to be different levels of intesity for workouts?

i guess, because if not, it's not gonna be so good.

I hope so, would be pretty pointless if it did not!

Yes, I would think so since they showed people of many different ages throughout the WiiFit trailer. As said, if that's not an included feature, then we won't be seeing the games full potential.

From the official Nintendo site:

Wii Fit will include more than 40 types of training activities designed to appeal to all members of a household. Training falls into four fitness categories:

• Aerobic Exercise: 10-minute exercises that are designed to get the heart pumping.

• Muscle Conditioning: Controlled motions using arms, legs and other body parts.

• Yoga Poses: Classic poses that focus on balance and stretching.

•Balance Games: Fun activities, such as ski jumping and heading footballs, that challenge the player’s overall body balance.

These exercises provide a “core” workout, a popular exercise method that emphasizes slower, controlled motions. Daily tests track two key measures that a household can track via progress charts:

• Body Mass Index (BMI): A weight evaluation based on a ratio of weight to height.

• Wii Fit Age: The Wii Fit Age is measured by factoring the user’s BMI reading, testing the user’s centre of gravity and conducting quick balance tests.

probly for people under <100 -they sit there and have to eat
100-150 maybe some arm movements
150-200 maybe some arm and legs
200+ intense movement

Thanks for the update Evolve.
Game looks good, and I would have been disappointed if there was not different activity levels.