It appears that director Bryan Singer will include Jean Grey, Cyclops, and Storm in X-Men: Apocalypse, which will conclude the trilogy featuring the young mutants featured in X-Men: First Class.  The decision to include the trio of founding X-Men members means that they will have be recast given the action in Apocalypse takes place 20 years before the first of Singer’s X-Men films (see "'X-Men: Apocalypse' Character Shift"), which was made in 2000 and starred Famke Janssen as Jean Grey and James Marsden as Cyclops.
 
The usually reliable Hollywood-insider site The Wrap cites multiple sources for a report that Elle Fanning and Chloe Moretz have already met with Singer about playing Jean Grey, and Hailee Steinfeld (True Grit, Begin Again) is also under consideration.  Official test offers have not yet been made and other actresses may be in consideration, though it appears that Singer wants an established young actress for the role of Jean Grey.
 
According to The Wrap, Singer is more open to finding a "fresh face" for the role of Cyclops with Ben Hardy, who plays Peter Beale on the long-running UK soaper EastEnders, Charlie Rowe, who is currently starring in the Fox TV series Red Band Society, and Timothee Chalamet, who plays Matthew McConaughey’s son in Christopher Nolan’s Interstellar, all reportedly in the running to play Cyclops according to The Wrap.
 
X-Men Apocalypse, which is slated to debut on May 27, 2016, is expected to focus largely on the relationship between Mystique played by Jennifer Lawrence and Magneto, who will be played by Michael Fassbender (see "Mystique/Magneto Romance at the Heart of 'X-Men: Apocalypse'").