I think that Iran doing a nuclear test is a very good guess.
As to North Korea, I would be unsurprised if they were to coordinate with Iran to do a reasonably simultaneous nuclear test also, or at least some more missile launches. That would sow much confusion among the Western powers as they tried to sort out what all had happened and might be about to happen.
If the North Koreans were to make a nuclear test they would however then risk a major Japanese response, possibly including an immediate repeal of Article 9.
On the other hand, this could all be more insane rhetoric from the raving nutcases running Iran. But I think we need to take military action very soon with respect to Iran. We have waited a long time past what I considered reasonable.
The Axis of Evil definitely has the initiative so far. The West is only reacting to their moves.