From what I understand, it will be very focused on new types of mechanics, which is probably a good thing.
But tying it to Victorian/19th-century spiritualism meets The Craft seems a tad redundant, theme-wise (not that new mechanics are bad or anything; people play both the Eldritch Knight and the Magus, after all).
Let's see what core-only wizards can do...
Astral projection
Clairvoyance
Sense ghosts, demons, and angels by their auras
See invisible and ethereal things
Telekinesis
Telepathy
Get answers to questions from spirits (though contact other plane is a tad more cinematic than the pendulum thing)
Summoning angels, demons, and various strange beings.
If anything, psychic magic or occult-style magic would be pretty lacking compared to the wizard/cleric, since even Aleister Crowley wasn't batsh!t insane enough to claim he could shoot fireballs and lightning bolts from his hands.