Ad 4. Elite judges is quite arbitrary. I'd rather iterate the test, each time choosing only those judges, who recognized program correctly or some variant of that (e.g. top 50% with most correct guesses). This way we select those, who go beyond simply conforming to a conversation and actually look for differences between program and human. (And as seen from transcripts, most people just try to have a conversation, rather than looking for flaws) Drawback is that, if program has set personality, judges could just stick to identifing that personality rather than human characteristics.
Another approach might be that, the same pair program-human is examined by 10 judges consecutively, each spending 5 minutes with both. The twist is that judges can leave instructions for next judges. So if program fails to perform "If you want to prove you're human, simply do nothing for 4 minutes, then re-type this sentence I've just written here, skipping one word out of 2", than every judge after the one, who found that flaw, can use that and make right guess.
My favourite method would be to give bot a simple physics textbook and then ask him to solve few physics test problems. Even if it wouldn't be actual AI, it would still prove helluva powerful. Just toss it summarized knowledge on quantum physics and ask to solve for GUT. Sadly, most humans wouldn't pass such high-school physics test.
EDIT:
Physics problems are an interesting test-- you could check for typical human mistakes.
You could throw in an unsolvable problem and see whether you get plausibly human reactions.
So the Turing test has been "passed", and the general consensus is that this was achieved in a very unimpressive way - the 13 year old Ukrainian persona was a cheat, the judges were incompetent, etc... These are all true, though the test did pass Turing's original criteria - and there are far more people willing to be dismissive of those criteria in retrospect than were in advance. It happened about 14 years later than Turing had been anticipating, which makes it quite a good prediction for 1950 (in my personal view, Turing made two mistakes that compensated - the "average interrogator" was a much lower bar than he thought, but progress on the subject would be much slower than he thought).
But anyway, the main goal now, as suggested by Toby Ord and others, is to design a better Turing test, something that can give AI designers something to aim at, and that would be a meaningful test of abilities. The aim is to ensure that if a program passes these new tests, we won't be dismissive of how it was achieved.
Here are a few suggestions I've heard about or thought about recently; can people suggest more and better ideas?
My current method would be the lazy one of simply typing this, then waiting, arms folded:
"If you want to prove you're human, simply do nothing for 4 minutes, then re-type this sentence I've just written here, skipping one word out of 2".