Surely Cortana will return in some shape or form in Halo 5. Do you think:
a) She’ll play a similar role as in the first 8 levels of Halo 3, and just be a mental creation in his head,
b) She has survived through the Didact somehow- perhaps in his armour configuration (or through some other Forerunner capacity),
c) Dr Halsey creates a ‘new’ version of Cortana for the Chief,
d) Won’t be in Halo 5,
e) Won’t be in any more Halo adaptations,
f) Other
I personally think she’ll play a role. I believe she (if not some version of her) is still alive in some type of Forerunner capacity.
Perhaps through the Didact’s armour configuration, or…
…you know how the Librarian dies on Earth 100,000 years ago, but imprints on Requiem during Halo 4? Perhaps Cortana will be ‘alive’ in a similar way? Perhaps Cortana has knowledge on how the Librarian did this? Cortana does, after all, have extensive knowledge of the Forerunners, from being in Installation 04’s control Room system.
If she has, in fact, survived this way, that would explain the Forerunner eagle-like structure that the Chief faces when trying to find Cortana in E3’s 2013 trailer; Cortana is imprisoned, locked away in some way or form by the Forerunners (or the Didact)- and the Chief is trying to find/rescue her. Th Eagle could be protecting a Forerunner shield world that she (and possibly the Didact) is on?
Surely she has found a way to survive.
Also, Cortana may be much more important than previously imagined, perhaps a Forerunner/Forerunner descendant? (Long shot, I know.)