Don't plan on Bungie making changes to integrate with CoD styles. They even mentioned on one of their latest podcasts how they do not care for unlockables that affect game play. They have stated that they will provide rewards and incentives for players to keep playing. What these are though, will be revealed at a later date.
Also, as from what has been said in previews and interviews, Bungie is using campaign maps\spaces for multiplayer. The obvious implications here are for Firefight so that AI will already have pathing knowledge of the maps. But there are some other possible outcomes of this fact. A game mode that has hereto been unknown. Perhaps something along the lines of L4D, where 1 team is human and the other controls covenant forces.
And just as a note, sprinting is only enabled once you equip the sprinting armor ability. It is not something that can be used without picking up this item.