Maybe they could make the old pelican but with the model of the new Mombasa pelican. One idea is the pelican coming with Linda and Fred vs soldiers with their forerunner cannon. Then the second Idea is to put the pelican with halo 2 master chief vs the new hunters from halo 5.
Another Idea is the halo 5 phantom. It could be with a darker purple and with the new plasma turret design.