IGN put up an article about Spartan Ops season 6.
It even has a video interview
with David Ellis with footage from a new mission.
I would definitely watch the video interview, it actually made me excited for Spartan Ops' return.
Spartan Ops' second half mixes up the locations as well, with 343 promising plenty of new and unexpected areas to lay waste to Covenant and Promethean forces. The way these environments unfold in Episode Six feels much more akin to an actual Halo campaign -- open-ended environments with more of that sandbox freedom -- than the recycled, mostly enclosed wave-based arenas from Episodes 1-5.
This is because 343 is taking advantage of its own resources -- with campaign designers and animators no longer working on the core Master Chief portion of Halo 4, they're more readily available to help create better, more interesting add-on missions for Spartan Ops. The studio's using more of its talent to make Spartan Ops better -- and it is absolutely working.