I do expect them to start with nicotine--probably the easiest for them to work with, and the one that's unarguably within their legal range. So if anything, I'd prioritize that first.
Mods second.
After that, PG, VG, wire (Kanthal, nichrome, SS, Ti, and Ni), wicking (whether rayon, silica, cotton, or other), and 18650 batteries shouldn't be impacted. They're all used for far too many other things, and can't be rendered useless for vaping without also rendering them useless for other purposes.
Flavoring might be "banned" for vaping purposes, but you won't have any trouble getting it. It's used for baking, candies, and a thousand other purposes both food related and not.