Regarding the North Korean launch schedule:
1. Timing. North Korea has a tendency to conduct space launches, missile tests, and nuclear weapons tests to demonstrate shows of national unity and technological and military might on national holidays (e.g. founding of DPRK, birthdays of Kim il-Sung and Kim Jong-il, et cetera). Given that North Korea wanted to mark Kim il-Sung's birthday of launching a rocket, we should not rule out the possibility that the DPRK may carry out a space launch either around the 2nd anniversary of Kim Jong-il's death or on the birthday of Kim Jong-un.
2. Nomenclature. It's interesting that the April 2009 launch was called Unha-2, while the 2012 launches were dubbed Unha-3. However, it would be a mistake to suggest that the Unha-2 and Unha-3 are two different rockets because they are about the same height (98 feet) and differ only in the type of fuel for the third stage (Unha-2 third stage used solid fuel, while Unha-3 third stage used liquid fuel). We know what Unha-9 looks like judging from photos released by North Korean state television, but we don't know if Unha-4 through Unha-8 will be the same height as Unha-2 and Unha-3. For now, the 2009 and 2012 launches should be referred to as Paektusan-2.