[HollyB]

This article says possibly tomorrow. Also, that if it goes over open water, the US will not shoot it down. But, the timing may still be speculation.

http://www.rjkoehler.com/2013/04/09/n-korea-to-launch-missile-tomorrow-report/

[ROCKLOBSTER]

if it goes over open water, the US will not shoot it down.

They should "shoot it down" on the launch pad.