Sounds like Wednesday is the day to watch. NK warned foreign diplomats that their safety couldn't be guaranteed, starting April 10. Not sure what the significance of that date is, if any, but it seems odd they would throw a random day in the middle of a random week out there.
The nukes scare me. If they nuke South Korea, we're almost bound by policy to retaliate in kind. Once the "Imperialist Americans" unleash a nuke, God only knows what response there will be from militant factions around the world.