I'm hoping in iClone7 to see more collision detection.

To be able to detect bone to bone driven shapes collision.
eg: Keep a tail from going through a leg.

To have particles bounce, curb, or accumulate upon hitting a shape.
eg: Smoke could accumulate under an awning and come out from the sides.

Prevent attached props from going through its avatar or other.
eg: Make the sheathed sword deflect/bounce off the body.

Particle to different particle collision detection.
eg: Have a fire extinguisher blast and displace fire.

It's not much but will add a great deal more possibilities.