Personally, I'd love to see a more systemic approach to coding. Perhaps a better sibling to coding is music: both have a number of "threads" interacting over time - both in and of themselves (FOR loop = a snare drum loop), but also with each other (Global scopes = a general 4/4 beat). Shifting between the two, parallel and serial, places an emphasis on the process rather than the output (which, perhaps, is what all coders are really interested in...?)
Yep, I want one of them Reactable thingies. And for all the reasons that Scribe suggests : being able to represent the systems of software in physical manipulable objects.