I don't think there is any package you could use currently that would create such a scene satisfactorily without quite a lot of work. Vue has built-in wind animation, but no particle system, so the rain and many other things would be hard to do well. A general-purpose, high-end 3D package like Maya, Softimage, or Max would probably be best, but again a lot of work would be required.
We don't have specific plans to add built-in or automated animation effects like wind to TG2. A particle system is something we have considered, but again we do not have specific short-term plans to add one. I do think it would add a lot of capability to the TG2 toolbox, but it's also a lot of work to add it.
In the short-term, any support of animated objects would be implemented either through object sequences, or using an open object animation format like Collada.
- Oshyan