In case you missed them, check them out here:

Spartan Ops and War games interview with Kiki Wolfkill. (Executive Producer at 343i on Halo 4)

Kiki goes over what Spartan Ops is, mentioned the episodes per week with they’re five related playable missions, covering 10 weeks of episodes/missions. The episodes are about “Majestic” squad, while you as a player will be part of “Crimson” squad.

Campaign Interview with Josh Holmes. (Creative Director at 343i on Halo 4)

Josh gives us some great info on the campaign, specifically why we are still facing the Covenant even after an apparent truce with them at the end of Halo 3.
The campaign itself takes place some 4 years 7 months after the events of Halo 3. Cortana is well past her shelf life as an AI.
You HAVE to check out the awesome assassination of a Promethan Knight in this clip.

Wow some REALLY cool images in both vids.

-Sal