Hii! We would love to hear all your questions about Caves&Cliffs. It can be about certain features, about the split of the update or anything else you want to ask related to it :). Feel free to share your questions in a thread to this tweet. Thank you! 
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Hi I am from the modding community and will this update affect it by a ton or not
My knowledge dates back to 1.8, but while raising the world limit itself is trivial, doing so in a performant way is not. Given the sheer number of changes affecting worldgen, I would expect updating mods to involve some level of effort.