The device the NorKs put into orbit likely does not contain a warhead, but we are not 100% sure. NorK technology could not, presently, create a 25 pound warhead.
There are some in the intelligence community who think that this might be part of a much larger attack on the west. Pakistan does have the capability to create small warheads and it is possible that the NorKs have one. The theory is that no one will take the threat from NK seriously and then, boom, the EMP hits the US. At the same time China launches an attack on Taiwan, Pakistan attacks India, several Middle Eastern states attack Israel, and North Korea invades South Korea. The US, dealing with it’s own problems, has no substantial military response. In a matter of days Israel is overrun, India is subjugated to Pakistan, Taiwan is under Chinese control, and North Korea controls the peninsula.
There are some who think the “Arab Spring” series of events was a destabilization effort by the WEST to delay this attack.
There are many signs pointing towards a gradual preparedness on the part of these states that may indicate that such a comprehensive attack is imminent. Pakistan has been increasing it’s presence on the India border. Several Middle Eastern states, most notably Egypt, have been ratcheting up their rhetoric towards Israel and mobilizing their troops. What better way to unify a divided populous than a war against a common enemy?
The attack that is coming is going to make Pearl Harbor and 9/11 look tame. We will be out of the picture. On a side note, I do think it is interesting that the Book of Revelation makes no mention of a nation like the United States involved in the final conflict. What if it is an EMP that puts us on the sidelines?
Intelligence knows with 100% certainty whether or not the satellite contains nuclear material, via sensors on other satellites.