If it had to be, artificer with relevant companions and all currently released subclasses (and maybe warforged) would be something that could be DLC. I'd rather they just implement all the spells from DnD Beyond instead of locking any behind DLC. As much as I would not want it to be locked away, additional race choices could be DLC bringing in a relevant companion and such. Ideally, I do not want them to cut anything mostly finished/partially finished to repackage as paid dlc and partially finished stuff implemented as free updates.
On stuff I would actually like as DLC, perhaps a side campaign in Waterdeep or heading to another plane like an adventure in the City of Brass with new characters, companions, and items.
