Well, the only thing I want are the gish stuff from the splat books. I am looking at you Sword Coast Adventurer's Guide - I need my booming blade and green flame blade.
There's some things like the 2 blade cantrips you mentioned or the expanded Invocation list for Warlock that feel like a must. They allow for interesting different builds and more depths. Without the (persumable) hassle that implementing each and every subclass would be. That bieng said is till want each and every subclass, it's sjut a great thing for replayability to have as many options as possible.
But I would understand it perfectly well if we don't get everything from the supplements with 1.0.
Just wait a few months down the line when I start pestering Larian for their Map editor so people can make fancy custom Adventures, some would be sure to even voice 'em if it happened for skyrim why not BG3. And don't get me started ont he possibilitie sif the yend up detachting char saves from Map saves. But that's for downt he line ^^
