User blog comment:NeverToWalkAlone/Halo 5, thoughts?/@comment-4603987-20130625175957

While before I said I was unimpressed by and uninterested in the storyline of the Halo 4 campaign, re-watching the episodes of Spartan Ops has restored at least a little bit of interest and caused me to think about what the plot of this next Halo will be.

More than likely, the UNSC has tracked Halsey and Jul 'Mdama to some other former Forerunner world (probably where the Absolute Record is located) and the crew of the UNSC Infinity will probably be given the task of killing the Covenant leadership there as well as Halsey.

At some point during the campaign, John probably decides he doesn't want to kill Halsey - at least not until he can restore Cortana - so he breaks off from the rest of the UNSC forces on the planet and sets out on his own journey to find Halsey before the UNSC can.