Here's a video interview with Nicholas Francis from Unity3D. Now, why do I mention this?
- it's stated that they are interested to become the 3D equivalence of flash
- you see transformation gizmos
- you see assets hotloading
- you see gfx card emulation
- you see network emulation (in the menu)
I know another tool that would benefit of having such features, too.
Edit: It's actually not with "Tom Higgins" but with "Nicholas Francis"