I saw Spartan Ops there as well.
I'm doubting Spartan Ops season 2 will happen, something of that magnitude I think would have been mentioned during the announcement, although it would be nice.
I'm hoping they will take the opportunity to put some "Firefight" options in as user selectable options in Spartan Ops. So by default Spartan Ops would play "as shipped" in Halo 4, but players would have the option to turn on some of the features ODST and Reach firefight had, such as a limited life pool, skulls, in-game medals, in-game scoring, infinite waves (game ends when life-pool runs out, not when time expires), random weapons, random enemy waves, bonus rounds, etc.
One thing I noticed, in the IGN interview with 343, when they got to the multiplayer menu, it says "Competitive or Co-operative Online | Spartan Ops". I realize the menus are a "work in progress", but that seems an odd wording to me - like it's three different things. Which would beg the question of what is "co-operative online". Coop campaign? Firefight? Or is it just saying that "co-operative online is Spartan Ops"? The line between "online" and "spartan ops" makes me question it.