To expand on that slightly: PSPs (like spell points) were largely based off of Wisdom, and then individual powers were based off of different attributes. I remember most of the body-shaping powers like Ectoplasmic Form and Body Weaponry were based off of Constitution; I am not sure but I think telepathic powers were based off of Wisdom and psychokinetic powers like Disintegrate/Detonate were based off of Intelligence; I am not sure about clairvoyant powers or metapsionic like Empower.
I sure would like to see metapsionic powers again like Split Personality. They were one of the things that made psionics feel very distinct.