The Halo series is known for its multiplayer, and 343 Studios certainly doesn't want to foul up that formula in Halo 4. That doesn't mean that they aren't willing to tweak a few things, however.

Halo 4's multiplayer is split into two main sections, War Games and Spartan Ops. War Games is a relatively traditional competitive multiplayer experience, with career-based progression.

Here's the official description, to give you an idea of what to expect:

The competitive multiplayer modes of “Halo 4,” known as War Games, take place on the combat deck of the UNSC Infinity and revive the visceral and immersive experiences that “Halo” multiplayer is famous for. Featuring 10 diverse and action-packed new multiplayer maps at launch, “Halo 4” introduces a broad variety of immersive new game modes and strategies to help you progress your Spartan-IV career, while delivering an experience that’s distinctly “Halo.”

Spartan Ops is more of a departure from the norm. These episodic adventures expand on the game's fiction, while giving fans of co-op gameplay a chance to work together. Again, here's the official description:

The story of the UNSC Infinity intersects with the “Halo 4” campaign, and then continues on in a brand-new, story-driven experience known as Spartan Ops. A first-of-its-kind, exciting new addition to the “Halo” franchise, Spartan Ops is an episodic adventure that blends immersive storytelling, high-quality cinematics and action-packed gameplay to deliver an unprecedented serialized experience.

Through a weekly series of cinematic episodes, Spartan Ops will tell the continuing story of the UNSC Infinity, following the events of “Halo 4.” These episodes will center on the UNSC Infinity leaders and crew as well as a new team of Spartans — Majestic Squad. These cinematic episodes will provide the backdrop for the weekly Spartan Ops gameplay missions. Playable in single-player or cooperatively with up to four players, Spartan Ops lets you explore the corners of Requiem in objective-based missions and help uncover the secrets of the mysterious Forerunner world. 

A massive-scale adventure that builds off the “Halo 4” story, access to Spartan Ops is included with “Halo 4” at no additional charge — effectively delivering two campaign experiences in one game.

For a ton of other details, check out our exclusive Halo 4 multiplayer videos. We highlight the changes to competitive multiplayer, dig deeper into Spartan Ops, and pass on our hands-on impressions of Halo 4.