It has been known since the announcement of the DDG(X) project by the Pentagon that when needed, smaller Mk41 VLS cells can be swapped with larger VLS cells for hypersonic missiles. I believe the G-VLS is meant for it.
With the case settled, one of the more important questions - What would be the dimension for the G-VLS?
On the other hand, speaking of which - Recall that some months ago, according to @tphuang, lyman2003 mentioned that the Type 093B SSNs that Huludao is starting to pump out since last year have 1.2-meter diameter VLS cells that can launch larger anti-ship ballistic missiles and hypersonic missiles in the future. Perhaps the PLAN will pursue larger VLS cells similar to this for their surface combatants in the future?
So I guess you could have less cells with the same number of missiles? I wonder if they will mix Mk. 41 with G-VLS or just go all in on G-VLS? Potentially one apparent drawback is that with less cells you cannot launch as many missiles simultaneously. I am not sure how much of a problem that really would be, but it seems like a potential setback.
I thought the Type 055 already had larger cells? Or is just that the Chinese implementation of VLS is more modern and thus takes a greater missile size into consideration? I am guessing the description of G-VLS indicates that it is an even larger cell (at least length wise), than those on the Type 055? Regardless, multiple navies want greater range and speed, and there is only so much you can do with a ~Mk. 41 sized VLS.
Edit: Also, do Crusiers even exist any more? These Destroyers are all like ~12,000+ tonnes! What would a true next-gen Cruiser even look like?