anyone have a cool idea of how the arbiter would appear in halo 5? I imagine either A) there's some kind of human/elite diplomatic meeting (in which Master Chief is invited to attend), on how to deal with didact and the promethians, or B) there's an epic battle between the UNSC and promethians/covenant remnant and the arbiter's forces suddenly appear... I also like Leviathan's idea in the epilogue of "shield and sword" of the arbiter materializing in MC's cell, saying "I have need of you."

How are arby and his followers going to react to hearing humanity is meant for the mantle, or that there's a living forerunner (one of their former gods) to contend with - jealousy? confusion?
Either way I hope they don't neglect him too much in the next game, i'd imagine he would want to see MC again after hearing he's alive.