I hope Larian Studios will makes these classes work in Baldur's Gate 3 with the hole theme being about mind flayers and having the mind flayer tadpole inside your head like being able to talk with the tadpole with telepathically and powering up your psychic powers
I've been thinking about it and I think the Aberrant Soul Sorcerer is WotC's attempt to emulate the Tadpole Skill Tree in Table Top D&D form.
"Or perhaps mind flayers kidnapped you, subjecting you to the nightmarish process of ceremorphosis—but the transformation failed and left you altered. " sounds like what happened more or less to the PC and Companions in BG3, more or less.
I'm betting if you are a Sorcerer you can use your Tadpole to fuel your Metamagic in place of Sorcery Points at times, but at a cost.