I've created an swf from an animation taking advantage of the new 3d tool in Flash Cs4 (different objects with different z-values).
As I import it into Adobe Premiere Cs4, the 3d part of the file basically does not appear, all the animations I've created using the 3d tool are now being ignored and playback only displays the conventional part of the animation.
Is Premiere not ready yet to properly display 3d animated content, created in Flash Cs4?
Flash isn't your typical source for Premiere. Normally it's the other way around.
For original animations, most often the entire project is simply done in Flash, no need to go into Premiere.