The Bulletin of the Atomic Scientists has commented on two unknowns about the new, large North Korean ICBM.
One question is how mobile the new missile will be. It is liquid fueled and huge, which means it will be hard to move, although it was displayed on a mobile vehicle. Since it is liquid fueled, it most likely would have to be moved to a fixed launch site and then fueled, allowing some advance notice that it is about to be launched.
The other question is how many warheads it will carry. After weighing the pros and cons of a multiple, MIRVed payload versus a single large warhead, the Bulletin seems to come down on the side of a single warhead as more likely to be within the technical prowess of the North Koreans.