2) are pretty much different missiles from the original IIA and B missiles although their designs are partially based on IIA and B.
IIC was first confirmed to have been in development ever since the second revision to the agreement and was first revealed in 2017 just a few months before the 3rd revision to the guideline. Since it was developed following new guidelines of 2012, it was said to have 800km range, although in 2022 it was reported that the missile was way more capable and had a longer range (around 1000km) and a heavier payload than what was agreed upon in the second revision. Although these are not official disclosures (just like any other information regarding any of the Hyunmoo missiles), it was reported by accountable reporters that enter MoD and are in line with previous allegations and leaks.
Unlike IIA and B, IIC's warhead is a separating MaRV. There's a development of this warhead equipped with a radar seeker, akin to Pershing-2 which is said to be intended for ASBM purposes but like everything else, its intended purposes were never disclosed. Clear image of RV in standalone was never revealed, although there's a footage of its reentry into the sea during the revealed test-fire.
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Due to longer range and heavier payload, 2) are much larger in size and are transported on newer 5X5 TEL that looks similar to HEMMT. It is rumored that the L-SAM launch vehicle as well as the MFR mount are also to use the same vehicle.
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(you could clearly see the size difference of the TEL as well as the missile canisters compared to the previous IIA/B TEL [nicknamed "feelers" in Korean forums since the side-view mirrors look like feelers of an insect] and canisters.)
A newer version of Hyunmoo II equipped with 2-ton penetrator warhead revealed last year is yet to be officially named, albeit there is a separate naming system within the DoD/AMSC for their missiles (meaning, "Hyunmoo-#X" is only a public name), which means this new missile obviously would have its own name, just not disclosed. This new missile seems to have a similar booster section to the IIC. It will still need a different guidance system to the IIC since unlike the IIC this newer missile is unitary.
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(fotos from post #36)
3) again is a much larger missile compared to both the IIC and the 2-ton penetrator. Hyunmoo IV-1 retains the range of over 800km all the while armed with a penetrator warhead in excess of 2 tons (reports regarding the mass of the penetrator ranges from 2 tons to 4 tons). Not a single footage, picture and data has been revealed regarding this missile and it is therefore unknown which TEL this missile is fired from (or if it's fired from a TEL or silo in a first place.). Although the namesake points towards commonalities to other Hyunmoo IV series ballistic missiles, it is believed that they are physically not related to one another. It was test fired and flew 400km on a lofted trajectory.
4) are naval ballistic missiles, IV-2 ship-launched and IV-4 submarine launched respectively. The South Korean SLBM which became quite famous when it was revealed last year is the IV-4. Information regarding IV-2 is even more scarce, although I've arbitrarily grouped them since both are naval ballistic missiles and it is heavily likely that a ship launched IV-2 is based on Hyunmoo IV-4 SLBM. Existence of IV-3 is unknown, although some speculate that the name is reserved for air-launched ballistic missile for the KF-21.
Although some speculate that Hyunmoo IV-4 is based on IIB, such as the English Wikipedia article, there are no evidence supporting this speculation. Other speculation suggests that it is a development of IIC, shrinked in scale, but this view again has no evidence to support. Combining the information leaked since the reveal, it rather seems like a new development than wholly based on existing designs. There is no information regarding its size, mass, range or payload.
5) is the newest, biggest and heaviest variant of Hyunmoo. Some calls it the Hyunmoo V but just like the 2-ton penetrator, its name has not yet been revealed. Although it is the newest, it has more information revealed (during parliamentary National Defense Committee Audit) than both 3) and 4). It was first tested in 2021 and was fired towards the sea south of Jeju Isle., demonstrating a CEP of 3m on a high sea-state condition and has a whopping 8-ton warhead and weighs 36 tons in total. Most of the warhead mass are the penetrator casing, while the explosive mass is minimal in comparison.
With its precision, reentry speed and penetrator mass, I don't think there's any North Korean underground facility this thing will not be able to penetrate into. Basically, unless NK fields their own ABM capabilities, it could replace MOP/NGP's role on the Korean theatre.
What was the most surprising for me was the fact that this missile is also launched from a TEL platform. For such reason it is cold-launched unlike most of the previous Hyunmoo ballistic missiles (bar the Hyunmoo IV-4 SLBM).
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(the new missile has what seems to be base-thrusters for divert control after launch. Its fins are folded inside the canister, which some suggests point towards possible development as SLBM but I am very much doubtful considering its size)
