The X-Men series of films dealt with the manifestation of the Phoenix in the Last Stand. The treatment of the story line was less than well received by many of the X-Men fans. One reason is that there were many changes to the overall story and that several main characters were killed in the midst of the story. Days of Future Past seems to have changed all of these events and reversed history. Jean Grey is now alive and could potentially still become the Phoenix.
The Phoenix gained much of her powers through being united with the other worldly power known as the Phoenix Force. The force would allow change the powers and abilities of those who encountered it. There have been two individuals who have been touched by the Phoenix Force. Jean Grey (Phoenix I) and her daughter from an alternate time line Rachael Summers (Phoenix II). Both women were changed by the experience with the Phoenix Force.
Powers and Abilities
The Phoenix Force allows the powers of those touched by its energy to have their existing power magnified to unknown degrees. The reality is that the Phoenix Force gave Jean Grey almost limitless amounts of power to tap. It can be assumed that the Phoenix Force would magnify any superhuman power that existed in the host.
Phoenix has the ability to manipulate matter on a molecular level and change the state of matter. Phoenix could cause solid matter to turn to liquid, change the physical state of matter through disintegration and create solid energy.
Phoenix could project beams of energy that would deliver great concussive force. Phoenix could also generate an energy talon that could grasp a target and physically lift them. It is assumed that the Phoenix could deliver enough force to crush most objects.
The Phoenix Force gave Rachael Summers the ability to travel through time. The power allowed Rachael to escape her time line and travel to mainstream time.
Telepathy gave Grey and Summers the ability to read minds, and plant thoughts into the minds of others. The Phoenix Force allowed them to gain a devastating attack with the psionic bolt. She can cast a bolt of pure psionic energy and overwhelm the mind of the target. The attack renders the target unconscious.
Telekinesis is the ability to move objects with the power of the mind. The Phoenix could levitate matter and even give herself the ability to fly at amazing speeds.
Will the Phoenix resurface for future X-Men films? It seems to be unlikely but it could provide for an interesting twist to the Apocalypse story line. No matter where the movie stories go, the X-Men were changed by their encounters with the Phoenix Force.