[Huayra]

What would be even more tight is that we get to see the Arbiter once again. I mean what happened to that guy?

The Arbiter, if i read correctly, was killed on Sangheilios under civil war between other clans. The Vadam clan was ridiculed for working with humans, so the Mdama clan united with alot of other clans and launched an attack on Vadam. I havn't finished the book that its in yet, so i might be wrong, but it doesnt look good for him ATM

The next Halo game might not be a complete new game. It might be a expansion from Halo 4.

Isnt every halo game an expansion from the previous game? it continues the story of the previous game, and if it was completely new, it wouldnt be canon, and not be related to halo in anyway