Halo 5 or other

So i was looking at one of the halo books about the Arbiter sp and i started to think about halo 2 and 3 how he survived and the ending etc.

i would LOVE to find out more about what he did after Halo 3 ended, was their home world under attack from brutes, or maybe the flood its self.

maybe more on who the covies are that your fighting in halo 4 and their leader or some thing.

would you want Halo 5 to bring the Arb back, or should it be a different game off to the side, kind of like ODST or Reach with its own story, if they make one.