The DazSlackers discord is going pretty crazy over G9. There are several PA's there singing high praises for it. Apparently it is a lot easier to work with, and they're making good arguments why. UVs are easier to work with, just one base mesh for everything.
Maybe something to keep in mind, easier means they can make more stuff quicker, which should increase supply, and lower prices. Well, lets see if the economics work out. They can also spend more time on it and increase quality instead, but I have a feeling which of those two behaviours is going to win in the market.
Anyways. They are also posting a bunch of additional images of G9 that I found interesting:
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Face of the base mesh up close already looks quite a lot more detailed then G8.
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It's nipple agnostic. I assume that will make it (somewhat) impossible to use generic nipple morphs on different figures, we will need either geografts or use a dedicated nipple morph for each figure.