I have to say I'm hugely disappointed in the story bringing Cortana back unless.. unless she is truly is an enemy that must be destroyed for good - preferably by the Chief.. But I fear this is going to be Cortana's mysterious returns means she's perceived to be evil, but she's not and because the Chief is trying to find her, he's now a target but when everybody gets together it's all one big mistake and oh no! A big space enemy has appeared, let's all work together to kill it and be back in time for cornflakes with hugs all around.
For the love of God, let's have an adult storyline where not everybody is true and good and just a little misunderstood and where everybody important survives, i.e. kids cartoon level writing. But I genuinely think 343 are fearful of doing anything bold, like killing off characters for good, because of fan reaction.
If this is how it pans out, I'm out of Halo after 5