I wrote a quip awhile back about wanting a scripting language closely integrated with Go. Maybe this would fit the bill? (Though one with a Go-like syntax would be better.)
That somewhat points to a development environment that I would like---a statically compiled language that is also easily interpreted. You develop with the interpreted version to get the quickest turnaround, and then you compile it for speed when you're ready to release your product.
Seems like LLVM or the JVM would both make this comfortable.