I have a feeling it will become more varied as Worlds goes on. Worlds is interesting in that we get these micro-metas within certain groups, like how Group A is playing around Rift Herald a lot more purely because Clutch does (even when Clutch wasn't in the game they were playing around it). We also typically don't see fresh picks until much later; bot players are pretty comfortable on Xayah and Kai'Sa since they were played so much during the regular season. Teams like to save their surprise picks until later, too.
We saw a bit of Tristana in various lanes, so I expect her to make many more appearances. Ezreal also had a good showing. Ashe was buffed and her utility plays great into certain comps, so we may be seeing her too. Not many ADC buffs on this patch but a few nerfs so this could tip the scales eventually and some less seen faces could resurface.
There's also been a handful of bot players playing mages in solo queue practice, so that's a real possibility. Heck, today we even saw Heimerdinger bot do very well.
Supports I'm not as sure. Hard to replace Rakan unless he's banned.