If it is possible the new expansion of Rise of Iron may contain 8v8. What does this mean? Combined Arms.
Look at the facts, if we are going to bump up a playlist to support 16 players, that means that we can finally bring combined arms up to have bigger battles. This is a good thing because if last gen is getting dropped, then it is a perfect time for this mode to shine.
This is only speculation so I'm completely guessing.
If this is going to become true, we could see a PvE type combined arms arena just like Halo Firefight (ODST and 5 Guardian's) and Call of Duty's Spec Ops Survival Mode.
This can bring way more replay ability for endgame on different maps with more unique enemies to play against.
And maybe some bosses to make it more interesting, hint hint.
Though, lag and other bugs would need to be addressed as well.
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Destiny sometimes struggles to matchmake 6v6 Iron Banner games. Introducing a playlist with 8v8 where only a few thousand concurrent players are on the playlist at a given time will mean eternal matchmaking times and horrendous lag due to searching for players around the globe.