OT, but makes me wonder: will 6 make for better or worse obfu? The absence of a zillion predefined variables is a counter argument. But the modifiable grammar makes me dream of whole new scenarios that I... well, cannot even dream of!!

I'll bet the answer is "better". I mean circumfix operators, for heaven's sake. All sorts of bizarre regex things. That really funky roles/methods/properties access syntax. The main downside is that it might not be possible to do things like have working programs consisting entirely of lowercase words.