In the off chance it does happen I doubt it will be armed with a nuclear warhead. Unless they managed the technology without doing the nuclear test that was predicted they would carry out several months ago. And though what we now is not concrete both South Korean and US experts have agreed that as of a month ago they did not have sufficient reentry capabilty for an ICBM. More concerning is the apparent lack of control of the DPRK, and the POTUS's switch from no regime plan change to a threat of regime change. That being said; I wouldn't put it past them to do it anyway, which could have some interesting ramifications.