They will probably just put the original gun back in. It's certainly the least expensive option. These are probably what the 136/137 and 138/139 are going to look like after their refits IMO:
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Talk about snail's pace. I am beginning to wonder whether the upgrade is worth it. The only advantage over 052D and 055 is that it can fire YJ-12.
Maybe yj-12 is not yet ready for VLS?
This brings me to the question which of the two is the better missile, the YJ-12 or the YJ-18? Being able to fire YJ-12 may not be an advantage at all if the YJ-18 proved to be a better weapon, although we probably need to detail all the parameters what makes an ASM a better weapon over the other.