I don't see anything suddenly more compelling about Python (which I've always liked, at least among imperative languages) but I for one was pretty startled to learn that V8 was already within 2-3x the cost of JVM bytecode. That can make server-side Javascript feasible for work where Python or Ruby would need an order of magnitude more rack units today.
Are there any Java developers who still haven't dabbled with dynamic languages but could still be convinced to?
I imagine that those who will already have done, and the rest will never touch any language not in the "enterprise" class (Java, C#, C++, COBOL etc.)