A lot of the stuff that “isn’t” Halo will most likely be changeable through the gametrype options.
Spartan Ops looks okay and I bet you forerunner vision will most likely taken out of most playlists after the first week.
Loadouts will probably work like we have seen them in BO and MW3. You can have your own or have to choose Pre set loadouts made in the game options.
Not a big fan of sprint+AA.
X to respawn can probably be a respawn option and Drop in and out MM might end up being in more of the “social” playlists.