The North Korean regime has been making the same or worse rhetoric for decades. Every once in a while news organizations will point out "Ooooh they just did x, y, z, they haven't done that before!" just to stir the hype. Don't forget they have shelled a South Korean island and sunk a South Korean warship, which would seem to be more likely to precede a conflict than saying "we're pointing our missiles at you white devir".
The North Korean armed forces and government would be destroyed in a matter of days, possibly hours, and they know it. Maybe there will be a war at some point, who knows. I think it's more likely the North falls victim to a power struggle, civil war, or reform-minded leader.
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