Taking cues from the multiplayer connection side of things, Bungie have revealed they're offering a similar system to linking players together for Halo: Reach's
co-operative campaign mode, offering a full matchmaking service to allow players to search for their friends, instead of having to launch the game together.
It's a simple fix to an issue many had with Halo 3 co-op team-up system for the game's story campaign, and obviously a welcome one. In typical Bungie fashion they revealed the feature thusly in the midst a Weekly Update
Totally Unrelated Question 4: Can I haz Campaign Matchmaking?
Totally Related Answer: Yes.
Now you can quickly search out good players when you hit annoying bottlenecks mid-game. Win win really.