Eh, that's disappointment. I wonder how much development time they are going to lose to getting Vulkan to work, hope it isn't taking time away from expanding content.
Given how badly Vulkan worked on my machine I wish they just shelve Vulkan and focus on the system that works.
First of all Vulkan works great, it gives me about 60+ extra FPS, if it does not work on your machine, well, to bad for you. Also, other then classes and races, you won't get any new content in EA. Just bug fixes and mechanical changes. Anyway, they should not drop Vulkan because it does not work for you, you are not the only player out there.
with class and races comes spells. There are druid specific spells... there is also Chaos Bolt, would be weird if they add sorcerer withotu the sorcerer bread and butter spell. They effectively already had Green-Flame blade in Divinity in the form of Sparking Swings... would be nice if that makes it in as the Eldritch Knight/Arcane Tricksters already feel mediocre without any melee attack cantrips.
however... I imagine they are just arbitrarily reserving Xanthars/SCAG for either DLC (as they didnt monetize Divinity very well) or another game license entirely assuming this game is received well enough that they can jump right into another contract for BG4. Its unfortunate but I do feel like holding back will effect the reception of the game, Xanthars specifically added stuff to the game that addressed design issues that 5e was having in general, that is essentially what all those cantrips were doing, adding function where it was lacking (Mold Earth for instance, essentially is a magical shovel). The story aspect of the game is great but if this is all the cantrips.... man, combat is going to be nothing like D&D. The main attack cantrips were build defining.
the worst thing is, they seem to have given Lae'Zel a bonus action Thorn Whip as her Illithid super power.... I really hope they dont hold back things like Hadar's Grasp or Thorn whip to arbitrarily make it one of the Ilithid powers, if the avoid all sourcebook content, they better not avoid any PHB content