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.
