Jean Grey and Psylocke have some unique powers from the sound of it. There are also a handful of new animations - mainly menu animations.
Jean Grey has:
Mental Burst: Fires a blast of telekinetic flame that homes in on enemies.
Psionic Boom: A telekinetic shockwave that burns the minds of enemies causing them to ignite for a time.
Calming Presence: Increases energy regeneration rate of the entire party for a time.
Mental Vortex: All allies turn a percentage of Damage inflicted into energy.
Mental Guardian: Projects a small piece of Phoenix essence from within that will attack enemies near Jean.
Mind Fry: A mental wave sweeps out, weakening enemies for a time. Also has a 50% chance to confuse, forcing victims to stand helplessly.
Cerebral Bolt: Shoots out a burst of telekinetic energy in the form of a butterfly.
Kinetic Drill: Psylocke hurls forward while surrounding herself in a torrent of psionic energy, finishing with a powerful drop kick.
Telekinetic Explosion: Releases a furious explosion of telekinetic energy to all enemies in a short range, knocking them back.
Mental Shroud: Hides from the minds of others, allowing her better chance to strike a critical location. Occasionally causes instant KO.
Butterfly Swarm: Psylocke generates swarms of telekinetic energy that seek out enemy targets and burst upon impact, stunning them briefly.
Psi-Blade: Summons a blade of telekinetic energy to slice through foes, drawing in energy with every KO. Evolves at higher ranks.